puppet: Move /var/lib/nagios_state creation to zulip::base.pp.

Previously, in Zulip voyager, the cron jobs would spew error emails
every time they ran, due to this directory not existing.

This also tightens the permissions for the folder and avoids needing
to create a nagios user for Zulip voyager; it should be writeable by
both root and the zulip user and world-readable (and thus readable by
the Nagios user on zulip.com systems).

puppet/zulip/files/puppet.conf

@@ -1,22 +0,0 @@
-[main]
-  server = puppet.zulip.com
-  environment = production
-  confdir = /etc/puppet
-  logdir=/var/log/puppet
-  vardir=/var/lib/puppet
-  ssldir=/var/lib/puppet/ssl
-  rundir=/var/run/puppet
-  factpath=$vardir/lib/facter
-  templatedir=$confdir/templates
-  prerun_command=/etc/puppet/etckeeper-commit-pre
-  postrun_command=/etc/puppet/etckeeper-commit-post
-  modulepath = /root/zulip/puppet:/etc/puppet/modules:/usr/share/puppet/modules
-
-[master]
-  environment = production
-  manifest    = $confdir/environments/$environment/manifests/site.pp
-  modulepath  = $confdir/environments/$environment/modules
-[agent]
-  report = true
-  show_diff = true
-  environment = production

puppet/zulip/files/redis/redis.conf

@@ -1,6 +1,6 @@
 # Redis configuration file example
 
-# Note on units: when memory size is needed, it is possible to specifiy
+# Note on units: when memory size is needed, it is possible to specify
 # it in the usual form of 1k 5GB 4M and so forth:
 #
 # 1k => 1000 bytes
@@ -12,6 +12,26 @@
 #
 # units are case insensitive so 1GB 1Gb 1gB are all the same.
 
+################################## INCLUDES ###################################
+
+# Include one or more other config files here.  This is useful if you
+# have a standard template that goes to all Redis server but also need
+# to customize a few per-server settings.  Include files can include
+# other files, so use this wisely.
+#
+# Notice option "include" won't be rewritten by command "CONFIG REWRITE"
+# from admin or Redis Sentinel. Since Redis always uses the last processed
+# line as value of a configuration directive, you'd better put includes
+# at the beginning of this file to avoid overwriting config change at runtime.
+#
+# If instead you are interested in using includes to override configuration
+# options, it is better to use include as the last line.
+#
+# include /path/to/local.conf
+# include /path/to/other.conf
+
+################################ GENERAL  #####################################
+
 # By default Redis does not run as a daemon. Use 'yes' if you need it.
 # Note that Redis will write a pid file in /var/run/redis.pid when daemonized.
 daemonize yes
@@ -24,9 +44,14 @@ pidfile /var/run/redis/redis-server.pid
 # If port 0 is specified Redis will not listen on a TCP socket.
 port 6379
 
-# If you want you can bind a single interface, if the bind option is not
-# specified all the interfaces will listen for incoming connections.
+# By default Redis listens for connections from all the network interfaces
+# available on the server. It is possible to listen to just one or multiple
+# interfaces using the "bind" configuration directive, followed by one or
+# more IP addresses.
 #
+# Examples:
+#
+# bind 192.168.1.100 10.0.0.1
 bind 127.0.0.1
 
 # Specify the path for the unix socket that will be used to listen for
@@ -39,15 +64,31 @@ bind 127.0.0.1
 # Close the connection after a client is idle for N seconds (0 to disable)
 timeout 0
 
-# Set server verbosity to 'debug'
-# it can be one of:
+# TCP keepalive.
+#
+# If non-zero, use SO_KEEPALIVE to send TCP ACKs to clients in absence
+# of communication. This is useful for two reasons:
+#
+# 1) Detect dead peers.
+# 2) Take the connection alive from the point of view of network
+#    equipment in the middle.
+#
+# On Linux, the specified value (in seconds) is the period used to send ACKs.
+# Note that to close the connection the double of the time is needed.
+# On other kernels the period depends on the kernel configuration.
+#
+# A reasonable value for this option is 60 seconds.
+tcp-keepalive 0
+
+# Specify the server verbosity level.
+# This can be one of:
 # debug (a lot of information, useful for development/testing)
 # verbose (many rarely useful info, but not a mess like the debug level)
 # notice (moderately verbose, what you want in production probably)
 # warning (only very important / critical messages are logged)
 loglevel notice
 
-# Specify the log file name. Also 'stdout' can be used to force
+# Specify the log file name. Also the empty string can be used to force
 # Redis to log on the standard output. Note that if you use standard
 # output for logging but daemonize, logs will be sent to /dev/null
 logfile /var/log/redis/redis-server.log
@@ -59,7 +100,7 @@ logfile /var/log/redis/redis-server.log
 # Specify the syslog identity.
 # syslog-ident redis
 
-# Specify the syslog facility.  Must be USER or between LOCAL0-LOCAL7.
+# Specify the syslog facility. Must be USER or between LOCAL0-LOCAL7.
 # syslog-facility local0
 
 # Set the number of databases. The default database is DB 0, you can select
@@ -67,7 +108,7 @@ logfile /var/log/redis/redis-server.log
 # dbid is a number between 0 and 'databases'-1
 databases 16
 
-################################ SNAPSHOTTING  #################################
+################################ SNAPSHOTTING  ################################
 #
 # Save the DB on disk:
 #
@@ -82,10 +123,31 @@ databases 16
 #   after 60 sec if at least 10000 keys changed
 #
 #   Note: you can disable saving at all commenting all the "save" lines.
+#
+#   It is also possible to remove all the previously configured save
+#   points by adding a save directive with a single empty string argument
+#   like in the following example:
+#
+#   save ""
 
-# save 900 1
-# save 300 10
-# save 60 10000
+save 900 1
+save 300 10
+save 60 10000
+
+# By default Redis will stop accepting writes if RDB snapshots are enabled
+# (at least one save point) and the latest background save failed.
+# This will make the user aware (in a hard way) that data is not persisting
+# on disk properly, otherwise chances are that no one will notice and some
+# disaster will happen.
+#
+# If the background saving process will start working again Redis will
+# automatically allow writes again.
+#
+# However if you have setup your proper monitoring of the Redis server
+# and persistence, you may want to disable this feature so that Redis will
+# continue to work as usual even if there are problems with disk,
+# permissions, and so forth.
+stop-writes-on-bgsave-error yes
 
 # Compress string objects using LZF when dump .rdb databases?
 # For default that's set to 'yes' as it's almost always a win.
@@ -93,6 +155,15 @@ databases 16
 # the dataset will likely be bigger if you have compressible values or keys.
 rdbcompression yes
 
+# Since version 5 of RDB a CRC64 checksum is placed at the end of the file.
+# This makes the format more resistant to corruption but there is a performance
+# hit to pay (around 10%) when saving and loading RDB files, so you can disable it
+# for maximum performances.
+#
+# RDB files created with checksum disabled have a checksum of zero that will
+# tell the loading code to skip the check.
+rdbchecksum yes
+
 # The filename where to dump the DB
 dbfilename dump.rdb
 
@@ -100,9 +171,9 @@ dbfilename dump.rdb
 #
 # The DB will be written inside this directory, with the filename specified
 # above using the 'dbfilename' configuration directive.
-#
-# Also the Append Only File will be created inside this directory.
-#
+# 
+# The Append Only File will also be created inside this directory.
+# 
 # Note that you must specify a directory here, not a file name.
 dir /var/lib/redis
 
@@ -122,27 +193,46 @@ dir /var/lib/redis
 #
 # masterauth <master-password>
 
-# When a slave lost the connection with the master, or when the replication
+# When a slave loses its connection with the master, or when the replication
 # is still in progress, the slave can act in two different ways:
 #
 # 1) if slave-serve-stale-data is set to 'yes' (the default) the slave will
-#    still reply to client requests, possibly with out of data data, or the
+#    still reply to client requests, possibly with out of date data, or the
 #    data set may just be empty if this is the first synchronization.
 #
-# 2) if slave-serve-stale data is set to 'no' the slave will reply with
+# 2) if slave-serve-stale-data is set to 'no' the slave will reply with
 #    an error "SYNC with master in progress" to all the kind of commands
 #    but to INFO and SLAVEOF.
 #
 slave-serve-stale-data yes
 
+# You can configure a slave instance to accept writes or not. Writing against
+# a slave instance may be useful to store some ephemeral data (because data
+# written on a slave will be easily deleted after resync with the master) but
+# may also cause problems if clients are writing to it because of a
+# misconfiguration.
+#
+# Since Redis 2.6 by default slaves are read-only.
+#
+# Note: read only slaves are not designed to be exposed to untrusted clients
+# on the internet. It's just a protection layer against misuse of the instance.
+# Still a read only slave exports by default all the administrative commands
+# such as CONFIG, DEBUG, and so forth. To a limited extent you can improve
+# security of read only slaves using 'rename-command' to shadow all the
+# administrative / dangerous commands.
+slave-read-only yes
+
 # Slaves send PINGs to server in a predefined interval. It's possible to change
 # this interval with the repl_ping_slave_period option. The default value is 10
 # seconds.
 #
 # repl-ping-slave-period 10
 
-# The following option sets a timeout for both Bulk transfer I/O timeout and
-# master data or ping response timeout. The default value is 60 seconds.
+# The following option sets the replication timeout for:
+#
+# 1) Bulk transfer I/O during SYNC, from the point of view of slave.
+# 2) Master timeout from the point of view of slaves (data, pings).
+# 3) Slave timeout from the point of view of masters (REPLCONF ACK pings).
 #
 # It is important to make sure that this value is greater than the value
 # specified for repl-ping-slave-period otherwise a timeout will be detected
@@ -150,6 +240,80 @@ slave-serve-stale-data yes
 #
 # repl-timeout 60
 
+# Disable TCP_NODELAY on the slave socket after SYNC?
+#
+# If you select "yes" Redis will use a smaller number of TCP packets and
+# less bandwidth to send data to slaves. But this can add a delay for
+# the data to appear on the slave side, up to 40 milliseconds with
+# Linux kernels using a default configuration.
+#
+# If you select "no" the delay for data to appear on the slave side will
+# be reduced but more bandwidth will be used for replication.
+#
+# By default we optimize for low latency, but in very high traffic conditions
+# or when the master and slaves are many hops away, turning this to "yes" may
+# be a good idea.
+repl-disable-tcp-nodelay no
+
+# Set the replication backlog size. The backlog is a buffer that accumulates
+# slave data when slaves are disconnected for some time, so that when a slave
+# wants to reconnect again, often a full resync is not needed, but a partial
+# resync is enough, just passing the portion of data the slave missed while
+# disconnected.
+#
+# The biggest the replication backlog, the longer the time the slave can be
+# disconnected and later be able to perform a partial resynchronization.
+#
+# The backlog is only allocated once there is at least a slave connected.
+#
+# repl-backlog-size 1mb
+
+# After a master has no longer connected slaves for some time, the backlog
+# will be freed. The following option configures the amount of seconds that
+# need to elapse, starting from the time the last slave disconnected, for
+# the backlog buffer to be freed.
+#
+# A value of 0 means to never release the backlog.
+#
+# repl-backlog-ttl 3600
+
+# The slave priority is an integer number published by Redis in the INFO output.
+# It is used by Redis Sentinel in order to select a slave to promote into a
+# master if the master is no longer working correctly.
+#
+# A slave with a low priority number is considered better for promotion, so
+# for instance if there are three slaves with priority 10, 100, 25 Sentinel will
+# pick the one with priority 10, that is the lowest.
+#
+# However a special priority of 0 marks the slave as not able to perform the
+# role of master, so a slave with priority of 0 will never be selected by
+# Redis Sentinel for promotion.
+#
+# By default the priority is 100.
+slave-priority 100
+
+# It is possible for a master to stop accepting writes if there are less than
+# N slaves connected, having a lag less or equal than M seconds.
+#
+# The N slaves need to be in "online" state.
+#
+# The lag in seconds, that must be <= the specified value, is calculated from
+# the last ping received from the slave, that is usually sent every second.
+#
+# This option does not GUARANTEES that N replicas will accept the write, but
+# will limit the window of exposure for lost writes in case not enough slaves
+# are available, to the specified number of seconds.
+#
+# For example to require at least 3 slaves with a lag <= 10 seconds use:
+#
+# min-slaves-to-write 3
+# min-slaves-max-lag 10
+#
+# Setting one or the other to 0 disables the feature.
+#
+# By default min-slaves-to-write is set to 0 (feature disabled) and
+# min-slaves-max-lag is set to 10.
+
 ################################## SECURITY ###################################
 
 # Require clients to issue AUTH <PASSWORD> before processing any other
@@ -158,7 +322,7 @@ slave-serve-stale-data yes
 #
 # This should stay commented out for backward compatibility and because most
 # people do not need auth (e.g. they run their own servers).
-#
+# 
 # Warning: since Redis is pretty fast an outside user can try up to
 # 150k passwords per second against a good box. This means that you should
 # use a very strong password otherwise it will be very easy to break.
@@ -167,33 +331,39 @@ slave-serve-stale-data yes
 
 # Command renaming.
 #
-# It is possilbe to change the name of dangerous commands in a shared
+# It is possible to change the name of dangerous commands in a shared
 # environment. For instance the CONFIG command may be renamed into something
-# of hard to guess so that it will be still available for internal-use
-# tools but not available for general clients.
+# hard to guess so that it will still be available for internal-use tools
+# but not available for general clients.
 #
 # Example:
 #
 # rename-command CONFIG b840fc02d524045429941cc15f59e41cb7be6c52
 #
-# It is also possilbe to completely kill a command renaming it into
+# It is also possible to completely kill a command by renaming it into
 # an empty string:
 #
 # rename-command CONFIG ""
+#
+# Please note that changing the name of commands that are logged into the
+# AOF file or transmitted to slaves may cause problems.
 
 ################################### LIMITS ####################################
 
-# Set the max number of connected clients at the same time. By default there
-# is no limit, and it's up to the number of file descriptors the Redis process
-# is able to open. The special value '0' means no limits.
+# Set the max number of connected clients at the same time. By default
+# this limit is set to 10000 clients, however if the Redis server is not
+# able to configure the process file limit to allow for the specified limit
+# the max number of allowed clients is set to the current file limit
+# minus 32 (as Redis reserves a few file descriptors for internal uses).
+#
 # Once the limit is reached Redis will close all the new connections sending
 # an error 'max number of clients reached'.
 #
-# maxclients 128
+# maxclients 10000
 
 # Don't use more memory than the specified amount of bytes.
 # When the memory limit is reached Redis will try to remove keys
-# accordingly to the eviction policy selected (see maxmemmory-policy).
+# according to the eviction policy selected (see maxmemory-policy).
 #
 # If Redis can't remove keys according to the policy, or if the policy is
 # set to 'noeviction', Redis will start to reply with errors to commands
@@ -201,7 +371,7 @@ slave-serve-stale-data yes
 # to reply to read-only commands like GET.
 #
 # This option is usually useful when using Redis as an LRU cache, or to set
-# an hard memory limit for an instance (using the 'noeviction' policy).
+# a hard memory limit for an instance (using the 'noeviction' policy).
 #
 # WARNING: If you have slaves attached to an instance with maxmemory on,
 # the size of the output buffers needed to feed the slaves are subtracted
@@ -217,16 +387,16 @@ slave-serve-stale-data yes
 # maxmemory <bytes>
 
 # MAXMEMORY POLICY: how Redis will select what to remove when maxmemory
-# is reached? You can select among five behavior:
-#
+# is reached. You can select among five behaviors:
+# 
 # volatile-lru -> remove the key with an expire set using an LRU algorithm
 # allkeys-lru -> remove any key accordingly to the LRU algorithm
 # volatile-random -> remove a random key with an expire set
-# allkeys->random -> remove a random key, any key
+# allkeys-random -> remove a random key, any key
 # volatile-ttl -> remove the key with the nearest expire time (minor TTL)
 # noeviction -> don't expire at all, just return an error on write operations
-#
-# Note: with all the kind of policies, Redis will return an error on write
+# 
+# Note: with any of the above policies, Redis will return an error on write
 #       operations, when there are not suitable keys for eviction.
 #
 #       At the date of writing this commands are: set setnx setex append
@@ -249,45 +419,51 @@ slave-serve-stale-data yes
 
 ############################## APPEND ONLY MODE ###############################
 
-# By default Redis asynchronously dumps the dataset on disk. If you can live
-# with the idea that the latest records will be lost if something like a crash
-# happens this is the preferred way to run Redis. If instead you care a lot
-# about your data and don't want to that a single record can get lost you should
-# enable the append only mode: when this mode is enabled Redis will append
-# every write operation received in the file appendonly.aof. This file will
-# be read on startup in order to rebuild the full dataset in memory.
+# By default Redis asynchronously dumps the dataset on disk. This mode is
+# good enough in many applications, but an issue with the Redis process or
+# a power outage may result into a few minutes of writes lost (depending on
+# the configured save points).
 #
-# Note that you can have both the async dumps and the append only file if you
-# like (you have to comment the "save" statements above to disable the dumps).
-# Still if append only mode is enabled Redis will load the data from the
-# log file at startup ignoring the dump.rdb file.
+# The Append Only File is an alternative persistence mode that provides
+# much better durability. For instance using the default data fsync policy
+# (see later in the config file) Redis can lose just one second of writes in a
+# dramatic event like a server power outage, or a single write if something
+# wrong with the Redis process itself happens, but the operating system is
+# still running correctly.
 #
-# IMPORTANT: Check the BGREWRITEAOF to check how to rewrite the append
-# log file in background when it gets too big.
+# AOF and RDB persistence can be enabled at the same time without problems.
+# If the AOF is enabled on startup Redis will load the AOF, that is the file
+# with the better durability guarantees.
+#
+# Please check http://redis.io/topics/persistence for more information.
 
 appendonly no
 
 # The name of the append only file (default: "appendonly.aof")
-# appendfilename appendonly.aof
+
+appendfilename "appendonly.aof"
 
 # The fsync() call tells the Operating System to actually write data on disk
-# instead to wait for more data in the output buffer. Some OS will really flush
+# instead to wait for more data in the output buffer. Some OS will really flush 
 # data on disk, some other OS will just try to do it ASAP.
 #
 # Redis supports three different modes:
 #
 # no: don't fsync, just let the OS flush the data when it wants. Faster.
 # always: fsync after every write to the append only log . Slow, Safest.
-# everysec: fsync only if one second passed since the last fsync. Compromise.
+# everysec: fsync only one time every second. Compromise.
 #
-# The default is "everysec" that's usually the right compromise between
+# The default is "everysec", as that's usually the right compromise between
 # speed and data safety. It's up to you to understand if you can relax this to
-# "no" that will will let the operating system flush the output buffer when
+# "no" that will let the operating system flush the output buffer when
 # it wants, for better performances (but if you can live with the idea of
 # some data loss consider the default persistence mode that's snapshotting),
 # or on the contrary, use "always" that's very slow but a bit safer than
 # everysec.
 #
+# More details please check the following article:
+# http://antirez.com/post/redis-persistence-demystified.html
+#
 # If unsure, use "everysec".
 
 # appendfsync always
@@ -305,21 +481,22 @@ appendfsync everysec
 # that will prevent fsync() from being called in the main process while a
 # BGSAVE or BGREWRITEAOF is in progress.
 #
-# This means that while another child is saving the durability of Redis is
-# the same as "appendfsync none", that in pratical terms means that it is
-# possible to lost up to 30 seconds of log in the worst scenario (with the
+# This means that while another child is saving, the durability of Redis is
+# the same as "appendfsync none". In practical terms, this means that it is
+# possible to lose up to 30 seconds of log in the worst scenario (with the
 # default Linux settings).
-#
+# 
 # If you have latency problems turn this to "yes". Otherwise leave it as
 # "no" that is the safest pick from the point of view of durability.
+
 no-appendfsync-on-rewrite no
 
 # Automatic rewrite of the append only file.
 # Redis is able to automatically rewrite the log file implicitly calling
-# BGREWRITEAOF when the AOF log size will growth by the specified percentage.
-#
+# BGREWRITEAOF when the AOF log size grows by the specified percentage.
+# 
 # This is how it works: Redis remembers the size of the AOF file after the
-# latest rewrite (or if no rewrite happened since the restart, the size of
+# latest rewrite (if no rewrite has happened since the restart, the size of
 # the AOF at startup is used).
 #
 # This base size is compared to the current size. If the current size is
@@ -328,12 +505,30 @@ no-appendfsync-on-rewrite no
 # is useful to avoid rewriting the AOF file even if the percentage increase
 # is reached but it is still pretty small.
 #
-# Specify a precentage of zero in order to disable the automatic AOF
+# Specify a percentage of zero in order to disable the automatic AOF
 # rewrite feature.
 
 auto-aof-rewrite-percentage 100
 auto-aof-rewrite-min-size 64mb
 
+################################ LUA SCRIPTING  ###############################
+
+# Max execution time of a Lua script in milliseconds.
+#
+# If the maximum execution time is reached Redis will log that a script is
+# still in execution after the maximum allowed time and will start to
+# reply to queries with an error.
+#
+# When a long running script exceed the maximum execution time only the
+# SCRIPT KILL and SHUTDOWN NOSAVE commands are available. The first can be
+# used to stop a script that did not yet called write commands. The second
+# is the only way to shut down the server in the case a write commands was
+# already issue by the script but the user don't want to wait for the natural
+# termination of the script.
+#
+# Set it to 0 or a negative value for unlimited execution without warnings.
+lua-time-limit 5000
+
 ################################## SLOW LOG ###################################
 
 # The Redis Slow Log is a system to log queries that exceeded a specified
@@ -342,7 +537,7 @@ auto-aof-rewrite-min-size 64mb
 # but just the time needed to actually execute the command (this is the only
 # stage of command execution where the thread is blocked and can not serve
 # other requests in the meantime).
-#
+# 
 # You can configure the slow log with two parameters: one tells Redis
 # what is the execution time, in microseconds, to exceed in order for the
 # command to get logged, and the other parameter is the length of the
@@ -358,88 +553,59 @@ slowlog-log-slower-than 10000
 # You can reclaim memory used by the slow log with SLOWLOG RESET.
 slowlog-max-len 128
 
-################################ VIRTUAL MEMORY ###############################
+############################# Event notification ##############################
 
-### WARNING! Virtual Memory is deprecated in Redis 2.4
-### The use of Virtual Memory is strongly discouraged.
-
-# Virtual Memory allows Redis to work with datasets bigger than the actual
-# amount of RAM needed to hold the whole dataset in memory.
-# In order to do so very used keys are taken in memory while the other keys
-# are swapped into a swap file, similarly to what operating systems do
-# with memory pages.
+# Redis can notify Pub/Sub clients about events happening in the key space.
+# This feature is documented at http://redis.io/topics/keyspace-events
+# 
+# For instance if keyspace events notification is enabled, and a client
+# performs a DEL operation on key "foo" stored in the Database 0, two
+# messages will be published via Pub/Sub:
 #
-# To enable VM just set 'vm-enabled' to yes, and set the following three
-# VM parameters accordingly to your needs.
-
-vm-enabled no
-# vm-enabled yes
-
-# This is the path of the Redis swap file. As you can guess, swap files
-# can't be shared by different Redis instances, so make sure to use a swap
-# file for every redis process you are running. Redis will complain if the
-# swap file is already in use.
+# PUBLISH __keyspace@0__:foo del
+# PUBLISH __keyevent@0__:del foo
 #
-# The best kind of storage for the Redis swap file (that's accessed at random)
-# is a Solid State Disk (SSD).
+# It is possible to select the events that Redis will notify among a set
+# of classes. Every class is identified by a single character:
 #
-# *** WARNING *** if you are using a shared hosting the default of putting
-# the swap file under /tmp is not secure. Create a dir with access granted
-# only to Redis user and configure Redis to create the swap file there.
-vm-swap-file /var/lib/redis/redis.swap
-
-# vm-max-memory configures the VM to use at max the specified amount of
-# RAM. Everything that deos not fit will be swapped on disk *if* possible, that
-# is, if there is still enough contiguous space in the swap file.
+#  K     Keyspace events, published with __keyspace@<db>__ prefix.
+#  E     Keyevent events, published with __keyevent@<db>__ prefix.
+#  g     Generic commands (non-type specific) like DEL, EXPIRE, RENAME, ...
+#  $     String commands
+#  l     List commands
+#  s     Set commands
+#  h     Hash commands
+#  z     Sorted set commands
+#  x     Expired events (events generated every time a key expires)
+#  e     Evicted events (events generated when a key is evicted for maxmemory)
+#  A     Alias for g$lshzxe, so that the "AKE" string means all the events.
 #
-# With vm-max-memory 0 the system will swap everything it can. Not a good
-# default, just specify the max amount of RAM you can in bytes, but it's
-# better to leave some margin. For instance specify an amount of RAM
-# that's more or less between 60 and 80% of your free RAM.
-vm-max-memory 0
-
-# Redis swap files is split into pages. An object can be saved using multiple
-# contiguous pages, but pages can't be shared between different objects.
-# So if your page is too big, small objects swapped out on disk will waste
-# a lot of space. If you page is too small, there is less space in the swap
-# file (assuming you configured the same number of total swap file pages).
+#  The "notify-keyspace-events" takes as argument a string that is composed
+#  by zero or multiple characters. The empty string means that notifications
+#  are disabled at all.
 #
-# If you use a lot of small objects, use a page size of 64 or 32 bytes.
-# If you use a lot of big objects, use a bigger page size.
-# If unsure, use the default :)
-vm-page-size 32
-
-# Number of total memory pages in the swap file.
-# Given that the page table (a bitmap of free/used pages) is taken in memory,
-# every 8 pages on disk will consume 1 byte of RAM.
+#  Example: to enable list and generic events, from the point of view of the
+#           event name, use:
 #
-# The total swap size is vm-page-size * vm-pages
+#  notify-keyspace-events Elg
 #
-# With the default of 32-bytes memory pages and 134217728 pages Redis will
-# use a 4 GB swap file, that will use 16 MB of RAM for the page table.
+#  Example 2: to get the stream of the expired keys subscribing to channel
+#             name __keyevent@0__:expired use:
 #
-# It's better to use the smallest acceptable value for your application,
-# but the default is large in order to work in most conditions.
-vm-pages 134217728
-
-# Max number of VM I/O threads running at the same time.
-# This threads are used to read/write data from/to swap file, since they
-# also encode and decode objects from disk to memory or the reverse, a bigger
-# number of threads can help with big objects even if they can't help with
-# I/O itself as the physical device may not be able to couple with many
-# reads/writes operations at the same time.
+#  notify-keyspace-events Ex
 #
-# The special value of 0 turn off threaded I/O and enables the blocking
-# Virtual Memory implementation.
-vm-max-threads 4
+#  By default all notifications are disabled because most users don't need
+#  this feature and the feature has some overhead. Note that if you don't
+#  specify at least one of K or E, no events will be delivered.
+notify-keyspace-events ""
 
 ############################### ADVANCED CONFIG ###############################
-# Hashes are encoded in a special way (much more memory efficient) when they
-# have at max a given numer of elements, and the biggest element does not
-# exceed a given threshold. You can configure this limits with the following
-# configuration directives.
-hash-max-zipmap-entries 512
-hash-max-zipmap-value 64
+
+# Hashes are encoded using a memory efficient data structure when they have a
+# small number of entries, and the biggest entry does not exceed a given
+# threshold. These thresholds can be configured using the following directives.
+hash-max-ziplist-entries 512
+hash-max-ziplist-value 64
 
 # Similarly to hashes, small lists are also encoded in a special way in order
 # to save a lot of space. The special representation is only used when
@@ -462,12 +628,12 @@ zset-max-ziplist-value 64
 
 # Active rehashing uses 1 millisecond every 100 milliseconds of CPU time in
 # order to help rehashing the main Redis hash table (the one mapping top-level
-# keys to values). The hash table implementation redis uses (see dict.c)
-# performs a lazy rehashing: the more operation you run into an hash table
-# that is rhashing, the more rehashing "steps" are performed, so if the
+# keys to values). The hash table implementation Redis uses (see dict.c)
+# performs a lazy rehashing: the more operation you run into a hash table
+# that is rehashing, the more rehashing "steps" are performed, so if the
 # server is idle the rehashing is never complete and some more memory is used
 # by the hash table.
-#
+# 
 # The default is to use this millisecond 10 times every second in order to
 # active rehashing the main dictionaries, freeing memory when possible.
 #
@@ -480,12 +646,65 @@ zset-max-ziplist-value 64
 # want to free memory asap when possible.
 activerehashing yes
 
-################################## INCLUDES ###################################
-
-# Include one or more other config files here.  This is useful if you
-# have a standard template that goes to all redis server but also need
-# to customize a few per-server settings.  Include files can include
-# other files, so use this wisely.
+# The client output buffer limits can be used to force disconnection of clients
+# that are not reading data from the server fast enough for some reason (a
+# common reason is that a Pub/Sub client can't consume messages as fast as the
+# publisher can produce them).
 #
-# include /path/to/local.conf
-# include /path/to/other.conf
+# The limit can be set differently for the three different classes of clients:
+#
+# normal -> normal clients
+# slave  -> slave clients and MONITOR clients
+# pubsub -> clients subscribed to at least one pubsub channel or pattern
+#
+# The syntax of every client-output-buffer-limit directive is the following:
+#
+# client-output-buffer-limit <class> <hard limit> <soft limit> <soft seconds>
+#
+# A client is immediately disconnected once the hard limit is reached, or if
+# the soft limit is reached and remains reached for the specified number of
+# seconds (continuously).
+# So for instance if the hard limit is 32 megabytes and the soft limit is
+# 16 megabytes / 10 seconds, the client will get disconnected immediately
+# if the size of the output buffers reach 32 megabytes, but will also get
+# disconnected if the client reaches 16 megabytes and continuously overcomes
+# the limit for 10 seconds.
+#
+# By default normal clients are not limited because they don't receive data
+# without asking (in a push way), but just after a request, so only
+# asynchronous clients may create a scenario where data is requested faster
+# than it can read.
+#
+# Instead there is a default limit for pubsub and slave clients, since
+# subscribers and slaves receive data in a push fashion.
+#
+# Both the hard or the soft limit can be disabled by setting them to zero.
+client-output-buffer-limit normal 0 0 0
+client-output-buffer-limit slave 256mb 64mb 60
+client-output-buffer-limit pubsub 32mb 8mb 60
+
+# Redis calls an internal function to perform many background tasks, like
+# closing connections of clients in timeout, purging expired keys that are
+# never requested, and so forth.
+#
+# Not all tasks are performed with the same frequency, but Redis checks for
+# tasks to perform accordingly to the specified "hz" value.
+#
+# By default "hz" is set to 10. Raising the value will use more CPU when
+# Redis is idle, but at the same time will make Redis more responsive when
+# there are many keys expiring at the same time, and timeouts may be
+# handled with more precision.
+#
+# The range is between 1 and 500, however a value over 100 is usually not
+# a good idea. Most users should use the default of 10 and raise this up to
+# 100 only in environments where very low latency is required.
+hz 10
+
+# When a child rewrites the AOF file, if the following option is enabled
+# the file will be fsync-ed every 32 MB of data generated. This is useful
+# in order to commit the file to the disk more incrementally and avoid
+# big latency spikes.
+aof-rewrite-incremental-fsync yes
+
+# Zulip-specific configuration: disable saving to disk.
+save ""

puppet/zulip/manifests/base.pp

@@ -40,14 +40,6 @@ class zulip::base {
     group      => 'zulip',
   }
 
-  file { '/etc/puppet/puppet.conf':
-    ensure     => file,
-    mode       => 640,
-    owner      => "root",
-    group      => "root",
-    source     => 'puppet:///modules/zulip/puppet.conf',
-  }
-
   file { '/etc/security/limits.conf':
     ensure     => file,
     mode       => 640,
@@ -56,6 +48,13 @@ class zulip::base {
     source     => 'puppet:///modules/zulip/limits.conf',
   }
 
+  # This directory is written to by cron jobs for reading by Nagios
+  file { '/var/lib/nagios_state/':
+    ensure     => directory,
+    group      => 'zulip',
+    mode       => 774,
+  }
+
   file { '/var/log/zulip':
     ensure => 'directory',
     owner  => 'zulip',

puppet/zulip_internal/manifests/base.pp

@@ -102,13 +102,6 @@ class zulip_internal::base {
     group      => "nagios",
     mode       => 600,
   }
-  file { '/var/lib/nagios_state/':
-    ensure     => directory,
-    require    => User['nagios'],
-    owner      => "nagios",
-    group      => "nagios",
-    mode       => 777,
-  }
   file { '/var/lib/nagios/.ssh':
     ensure     => directory,
     require    => File['/var/lib/nagios/'],

scripts/lib/install

@@ -12,8 +12,7 @@ EOF
 
 apt-get update
 apt-get -y dist-upgrade
-apt-get install -y puppet git
-cp -a /root/zulip/puppet/zulip/files/puppet.conf /etc/puppet/
+apt-get install -y puppet git python
 
 mkdir -p /etc/zulip
 echo -e "[machine]\npuppet_classes = zulip::voyager\ndeploy_type = voyager" > /etc/zulip/zulip.conf

scripts/zulip-puppet-apply

@@ -23,7 +23,7 @@ include apt
 for pclass in re.split(r'\s*,\s*', config.get('machine', 'puppet_classes')):
     puppet_config += "include %s\n" % (pclass,)
 
-puppet_cmd = ["puppet", "apply", "-e", puppet_config]
+puppet_cmd = ["puppet", "apply", "--modulepath=/root/zulip/puppet", "-e", puppet_config]
 puppet_cmd += extra_args
 
 if force:

tools/deprecated/install-server

@@ -86,8 +86,6 @@ git checkout $branch
 EOF
 
 ssh "${SSH_OPTS[@]}" "$server" -t -i "$amazon_key_file" -lroot <<EOF
-cp -a /root/zulip/puppet/zulip/files/puppet.conf /etc/puppet/
-
 userdel admin
 passwd -d root
 mkdir /etc/zulip

zproject/local_settings_template.py

@@ -42,6 +42,9 @@ SSO_APPEND_DOMAIN = None
 # outgoing port must be 587. The EMAIL_HOST is prepopulated
 # for GMail servers, change it for other hosts, or leave it unset
 # or empty to skip sending email.
+#
+# A common problem you may encounter when trying to get this working
+# is many hosting providers block outgoing SMTP traffic.
 EMAIL_HOST = 'smtp.gmail.com'
 EMAIL_HOST_USER = ''
 # If you're using password auth, you will need to put the password in