CentOS 搭建Graylog集群详解

1. Graylog2 简介

Graylog 是一个简单易用、功能较全面的日志管理工具，相比 ELK 组合， 优点：

• • 部署维护简单，一体化解决方案，不像ELK三个独立系统集成。
  • 查相比ES json语法，搜索语法更加简单，如 source:mongo AND reponse_time_ms:>5000。
  • 内置简单的告警。
  • 可以将搜索条件导出为 json格式文本，方便开发调用ES rest api搜索脚本。
  • 自己开发采集日志的脚本，并用curl/nc发送到Graylog Server，发送格式是自定义的GELF，Flunted和Logstash都有相应的输出GELF消息的插件。自己开发带来很大的自由度。实际上只需要用inotifywait监控日志的modify事件，并把日志的新增行用curl/netcat发送到Graylog Server就可。
  • UI 比较友好，搜索结果高亮显示。

当然，在拓展性上，graylog还是不如ELK。

Graylog整体组成：

• • Graylog提供 graylog 对外接口， CPU 密集
  • Elasticsearch 日志文件的持久化存储和检索， IO 密集 
  • MongoDB 存储一些 Graylog 的配置 

2. Graylog架构

　　单server架构 :

　　Graylog集群架构 :

3. Graylog安装

这里我搭建的是集群方案，但是将ES与Graylog和MongoDB部署在同一台server上。

　　① 前提条件：

$ sudo yum install java-1.8.0-openjdk-headless.x86_64$ sed -i 's/^SELINUX=enforcing/SELINUX=disabled/' /etc/selinux/config$ setenforce 0#安装pwgen$ sudo yum install epel-release$ sudo yum install pwgen　　

　　② MongoDB安装：

创建/etc/yum.repos.d/mongodb-org-3.2.repo文件，添加如下内容：

[mongodb-org-3.2]
name=MongoDB Repository
baseurl=https://repo.mongodb.org/yum/RedHat/$releasever/mongodb-org/3.2/x86_64/
gpgcheck=1
enabled=1
gpgkey=https://www.mongodb.org/static/pgp/server-3.2.asc

安装MongoDB：

sudo yum install mongodb-org

启动服务：

$ sudo chkconfig --add mongod
$ sudo systemctl daemon-reload
$ sudo systemctl enable mongod.service
$ sudo systemctl start mongod.service

　　③Elasticsearch安装：

Graylog 2.3.x 支持 Elasticsearch 5.x版本。

首先安装Elastic GPG key以及repository文件，然后yum安装：

$ rpm --import https://artifacts.elastic.co/GPG-KEY-elasticsearch
$ cat /etc/yum.repos.d/elasticsearch.repo
[elasticsearch-5.x]
name=Elasticsearch repository for 5.x packages
baseurl=https://artifacts.elastic.co/packages/5.x/yum
gpgcheck=1
gpgkey=https://artifacts.elastic.co/GPG-KEY-elasticsearch
enabled=1
autorefresh=1
type=rpm-md$ sudo yum install elasticsearch

编辑Elasticsearch配置文件/etc/elasticsearch/elasticsearch.yml，添加cluster信息：

# cat /etc/elasticsearch/elasticsearch.yml 
# ======================== Elasticsearch Configuration =========================
#
# NOTE: Elasticsearch comes with reasonable defaults for most settings.
#       Before you set out to tweak and tune the configuration, make sure you
#       understand what are you trying to accomplish and the consequences.
#
# The primary way of configuring a node is via this file. This template lists
# the most important settings you may want to configure for a production cluster.
#
# Please consult the documentation for further information on configuration options:
# https://www.elastic.co/guide/en/elasticsearch/reference/index.html
#
# ---------------------------------- Cluster -----------------------------------
#
# Use a descriptive name for your cluster:
#
cluster.name: graylog
#
# ------------------------------------ Node ------------------------------------
#
# Use a descriptive name for the node:
#
node.name: shop-log-02
#
# Add custom attributes to the node:
#
#node.attr.rack: r1
#
# ----------------------------------- Paths ------------------------------------
#
# Path to directory where to store the data (separate multiple locations by comma):
#
path.data: /data/elasticsearch/db
#
# Path to log files:
#
path.logs: /data/elasticsearch/logs
#
# ----------------------------------- Memory -----------------------------------
#
# Lock the memory on startup:
#
#bootstrap.memory_lock: true
#
# Make sure that the heap size is set to about half the memory available
# on the system and that the owner of the process is allowed to use this
# limit.
#
# Elasticsearch performs poorly when the system is swapping the memory.
#
# ---------------------------------- Network -----------------------------------
#
# Set the bind address to a specific IP (IPv4 or IPv6):
#
network.host: 10.2.2.42
#
# Set a custom port for HTTP:
#
http.port: 9200
#
# For more information, consult the network module documentation.
#
# --------------------------------- Discovery ----------------------------------
#
# Pass an initial list of hosts to perform discovery when new node is started:
# The default list of hosts is ["127.0.0.1", "[::1]"]
#
# 这里给其他两个节点的地址
discovery.zen.ping.unicast.hosts: ["10.2.2.41", "10.2.2.43"]
#
# Prevent the "split brain" by configuring the majority of nodes (total number of master-eligible nodes / 2 + 1):
#
discovery.zen.minimum_master_nodes: 2
#
# For more information, consult the zen discovery module documentation.
#
# ---------------------------------- Gateway -----------------------------------
#
# Block initial recovery after a full cluster restart until N nodes are started:
#
#gateway.recover_after_nodes: 3
#
# For more information, consult the gateway module documentation.
#
# ---------------------------------- Various -----------------------------------
#
# Require explicit names when deleting indices:
#
#action.destructive_requires_name: true
http.cors.enabled: true
http.cors.allow-origin: "*"

elasticsearch.yml

启动Elasticsearch服务：

$ sudo chkconfig --add elasticsearch
$ sudo systemctl daemon-reload
$ sudo systemctl enable elasticsearch.service
$ sudo systemctl restart elasticsearch.service

　　④Graylog安装

$ sudo rpm -Uvh https://packages.graylog2.org/repo/packages/graylog-2.3-repository_latest.rpm
$ sudo yum install graylog-server

编辑graylog配置文件 /etc/graylog/server/server.conf，添加 password_secret和 password_secret_sha2(必须)

可以使用 echo -n yourpassword | sha256sum 命令来生成 password_secret_sha2。

　　设置rest_listen_uri以及web_listen_uri为公共ip或公共hostname，以便连接graylog。

# cat /etc/graylog/server/server.conf
############################
# GRAYLOG CONFIGURATION FILE
############################
#
# This is the Graylog configuration file. The file has to use ISO 8859-1/Latin-1 character encoding.
# Characters that cannot be directly represented in this encoding can be written using Unicode escapes
# as defined in https://docs.Oracle.com/javase/specs/jls/se8/html/jls-3.html#jls-3.3, using the \u prefix.
# For example, \u002c.
#
# * Entries are generally expected to be a single line of the form, one of the following:
#
# propertyName=propertyValue
# propertyName:propertyValue
#
# * White space that appears between the property name and property value is ignored,
#  so the following are equivalent:
#
# name=Stephen
# name = Stephen
#
# * White space at the beginning of the line is also ignored.
#
# * Lines that start with the comment characters ! or # are ignored. Blank lines are also ignored.
#
# * The property value is generally terminated by the end of the line. White space following the
#  property value is not ignored, and is treated as part of the property value.
#
# * A property value can span several lines if each line is terminated by a backslash (鈥榎鈥 character.
#  For example:
#
# targetCities=\
#        Detroit,\
#        Chicago,\
#        Los Angeles
#
#  This is equivalent to targetCities=Detroit,Chicago,Los Angeles (white space at the beginning of lines is ignored).
#
# * The characters newline, carriage return, and tab can be inserted with characters \n, \r, and \t, respectively.
#
# * The backslash character must be escaped as a double backslash. For example:
#
# path=c:\\docs\\doc1
#

# If you are running more than one instances of Graylog server you have to select one of these
# instances as master. The master will perform some periodical tasks that non-masters won't perform.
is_master = false

# The auto-generated node ID will be stored in this file and read after restarts. It is a good idea
# to use an absolute file path here if you are starting Graylog server from init scripts or similar.
node_id_file = /etc/graylog/server/node-id

# You MUST set a secret to secure/pepper the stored user passwords here. Use at least 64 characters.
# Generate one by using for example: pwgen -N 1 -s 96
password_secret = BjwAAuTEWDQNtAKhUL5lQ3TvW41saWseKpRdTSrecBFifsCJDXak4fudnACBcaMyl0I4yzJDF801Kyasdfsdfasdfasdfasd

# The default root user is named 'admin'
root_username = admin

# You MUST specify a hash password for the root user (which you only need to initially set up the
# system and in case you lose connectivity to your authentication backend)
# This password cannot be changed using the API or via the web interface. If you need to change it,
# modify it in this file.
# Create one by using for example: echo -n yourpassword | shasum -a 256
# and put the resulting hash value into the following line
root_password_sha2 = 926c00b3f65df24b65a9a7b58a989add920c81441dccd2
dsfasdfasdf
# The email address of the root user.
# Default is empty
#root_email = ""

# The time zone setting of the root user. See http://www.joda.org/joda-time/timezones.html for a list of valid time zones.
# Default is UTC
root_timezone = Asia/Shanghai

# Set plugin directory here (relative or absolute)
plugin_dir = /usr/share/graylog-server/plugin

# REST API listen URI. Must be reachable by other Graylog server nodes if you run a cluster.
# When using Graylog Collectors, this URI will be used to receive heartbeat messages and must be accessible for all collectors.
rest_listen_uri = http://10.2.2.42:9000/api/

# REST API transport address. Defaults to the value of rest_listen_uri. Exception: If rest_listen_uri
# is set to a wildcard IP address (0.0.0.0) the first non-loopback IPv4 system address is used.
# If set, this will be promoted in the cluster discovery APIs, so other nodes may try to connect on
# this address and it is used to generate URLs addressing entities in the REST API. (see rest_listen_uri)
# You will need to define this, if your Graylog server is running behind a HTTP proxy that is rewriting
# the scheme, host name or URI.
# This must not contain a wildcard address (0.0.0.0).
rest_transport_uri = http://10.2.2.42:9000/api/

# Enable CORS headers for REST API. This is necessary for JS-clients accessing the server directly.
# If these are disabled, modern browsers will not be able to retrieve resources from the server.
# This is enabled by default. Uncomment the next line to disable it.
#rest_enable_cors = false

# Enable GZIP support for REST API. This compresses API responses and therefore helps to reduce
# overall round trip times. This is enabled by default. Uncomment the next line to disable it.
#rest_enable_gzip = false

# Enable HTTPS support for the REST API. This secures the communication with the REST API with
# TLS to prevent request forgery and eavesdropping. This is disabled by default. Uncomment the
# next line to enable it.
#rest_enable_tls = true

# The X.509 certificate chain file in PEM format to use for securing the REST API.
#rest_tls_cert_file = /path/to/graylog.crt

# The PKCS#8 private key file in PEM format to use for securing the REST API.
#rest_tls_key_file = /path/to/graylog.key

# The password to unlock the private key used for securing the REST API.
#rest_tls_key_password = secret

# The maximum size of the HTTP request headers in bytes.
#rest_max_header_size = 8192

# The maximal length of the initial HTTP/1.1 line in bytes.
#rest_max_initial_line_length = 4096

# The size of the thread pool used exclusively for serving the REST API.
#rest_thread_pool_size = 16

# Comma separated list of trusted proxies that are allowed to set the client address with X-Forwarded-For
# header. May be subnets, or hosts.
#trusted_proxies = 127.0.0.1/32, 0:0:0:0:0:0:0:1/128

# Enable the embedded Graylog web interface.
# Default: true
web_enable = true

# Web interface listen URI.
# Configuring a path for the URI here effectively prefixes all URIs in the web interface. This is a replacement
# for the application.context configuration parameter in pre-2.0 versions of the Graylog web interface.
web_listen_uri = http://10.2.2.42:9000/

# Web interface endpoint URI. This setting can be overriden on a per-request basis with the X-Graylog-Server-URL header.
# Default: $rest_transport_uri
web_endpoint_uri = http://42.111.111.111:9000/api

# Enable CORS headers for the web interface. This is necessary for JS-clients accessing the server directly.
# If these are disabled, modern browsers will not be able to retrieve resources from the server.
web_enable_cors = true

# Enable/disable GZIP support for the web interface. This compresses HTTP responses and therefore helps to reduce
# overall round trip times. This is enabled by default. Uncomment the next line to disable it.
#web_enable_gzip = false

# Enable HTTPS support for the web interface. This secures the communication of the web browser with the web interface
# using TLS to prevent request forgery and eavesdropping.
# This is disabled by default. Uncomment the next line to enable it and see the other related configuration settings.
#web_enable_tls = true

# The X.509 certificate chain file in PEM format to use for securing the web interface.
#web_tls_cert_file = /path/to/graylog-web.crt

# The PKCS#8 private key file in PEM format to use for securing the web interface.
#web_tls_key_file = /path/to/graylog-web.key

# The password to unlock the private key used for securing the web interface.
#web_tls_key_password = secret

# The maximum size of the HTTP request headers in bytes.
#web_max_header_size = 8192

# The maximal length of the initial HTTP/1.1 line in bytes.
#web_max_initial_line_length = 4096

# The size of the thread pool used exclusively for serving the web interface.
#web_thread_pool_size = 16

# List of Elasticsearch hosts Graylog should connect to.
# Need to be specified as a comma-separated list of valid URIs for the http ports of your elasticsearch nodes.
# If one or more of your elasticsearch hosts require authentication, include the credentials in each node URI that
# requires authentication.
#
# Default: http://127.0.0.1:9200
elasticsearch_hosts = http://grayloguser:[email protected]:9200,http://grayloguser:[email protected]:9200,http://grayloguser:[email protected]:9200

# Maximum amount of time to wait for successfull connection to Elasticsearch HTTP port.
#
# Default: 10 Seconds
#elasticsearch_connect_timeout = 10s

# Maximum amount of time to wait for reading back a response from an Elasticsearch server.
#
# Default: 60 seconds
#elasticsearch_socket_timeout = 60s

# Maximum idle time for an Elasticsearch connection. If this is exceeded, this connection will
# be tore down.
#
# Default: inf
#elasticsearch_idle_timeout = -1s

# Maximum number of total connections to Elasticsearch.
#
# Default: 20
#elasticsearch_max_total_connections = 20

# Maximum number of total connections per Elasticsearch route (normally this means per
# elasticsearch server).
#
# Default: 2
#elasticsearch_max_total_connections_per_route = 2

# Maximum number of times Graylog will retry failed requests to Elasticsearch.
#
# Default: 2
#elasticsearch_max_retries = 2

# Enable automatic Elasticsearch node discovery through Nodes Info,
# see https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cluster-nodes-info.html
#
# WARNING: Automatic node discovery does not work if Elasticsearch requires authentication, e. g. with Shield.
#
# Default: false
#elasticsearch_discovery_enabled = true

# Filter for including/excluding Elasticsearch nodes in discovery according to their custom attributes,
# see https://www.elastic.co/guide/en/elasticsearch/reference/5.4/cluster.html#cluster-nodes
#
# Default: empty
#elasticsearch_discovery_filter = rack:42

# Frequency of the Elasticsearch node discovery.
#
# Default: 30s
# elasticsearch_discovery_frequency = 30s

# Enable payload compression for Elasticsearch requests.
#
# Default: false
#elasticsearch_compression_enabled = true

# Graylog will use multiple indices to store documents in. You can configured the strategy it uses to determine
# when to rotate the currently active write index.
# It supports multiple rotation strategies:
#  - "count" of messages per index, use elasticsearch_max_docs_per_index below to configure
#  - "size" per index, use elasticsearch_max_size_per_index below to configure
# valid values are "count", "size" and "time", default is "count"
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
rotation_strategy = count

# (Approximate) maximum number of documents in an Elasticsearch index before a new index
# is being created, also see no_retention and elasticsearch_max_number_of_indices.
# Configure this if you used 'rotation_strategy = count' above.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
elasticsearch_max_docs_per_index = 20000000

# (Approximate) maximum size in bytes per Elasticsearch index on disk before a new index is being created, also see
# no_retention and elasticsearch_max_number_of_indices. Default is 1GB.
# Configure this if you used 'rotation_strategy = size' above.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#elasticsearch_max_size_per_index = 1073741824

# (Approximate) maximum time before a new Elasticsearch index is being created, also see
# no_retention and elasticsearch_max_number_of_indices. Default is 1 day.
# Configure this if you used 'rotation_strategy = time' above.
# Please note that this rotation period does not look at the time specified in the received messages, but is
# using the real clock value to decide when to rotate the index!
# Specify the time using a duration and a suffix indicating which unit you want:
#  1w  = 1 week
#  1d  = 1 day
#  12h = 12 hours
# Permitted suffixes are: d for day, h for hour, m for minute, s for second.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
#elasticsearch_max_time_per_index = 1d

# Disable checking the version of Elasticsearch for being compatible with this Graylog release.
# WARNING: Using Graylog with unsupported and untested versions of Elasticsearch may lead to data loss!
#elasticsearch_disable_version_check = true

# Disable message retention on this node, i. e. disable Elasticsearch index rotation.
#no_retention = false

# How many indices do you want to keep?
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
elasticsearch_max_number_of_indices = 20

# Decide what happens with the oldest indices when the maximum number of indices is reached.
# The following strategies are availble:
#  - delete # Deletes the index completely (Default)
#  - close # Closes the index and hides it from the system. Can be re-opened later.
#
# ATTENTION: These settings have been moved to the database in 2.0. When you upgrade, make sure to set these
#            to your previous 1.x settings so they will be migrated to the database!
retention_strategy = delete

# How many Elasticsearch shards and replicas should be used per index? Note that this only applies to newly created indices.
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
elasticsearch_shards = 3
elasticsearch_replicas = 1

# Prefix for all Elasticsearch indices and index aliases managed by Graylog.
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
elasticsearch_index_prefix = graylog

# Name of the Elasticsearch index template used by Graylog to apply the mandatory index mapping.
# Default: graylog-internal
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#elasticsearch_template_name = graylog-internal

# Do you want to allow searches with leading wildcards? This can be extremely resource hungry and should only
# be enabled with care. See also: http://docs.graylog.org/en/2.1/pages/queries.html
allow_leading_wildcard_searches = false

# Do you want to allow searches to be highlighted? Depending on the size of your messages this can be memory hungry and
# should only be enabled after making sure your Elasticsearch cluster has enough memory.
allow_highlighting = true

# Analyzer (tokenizer) to use for message and full_message field. The "standard" filter usually is a good idea.
# All supported analyzers are: standard, simple, whitespace, stop, keyword, pattern, language, snowball, custom
# Elasticsearch documentation: https://www.elastic.co/guide/en/elasticsearch/reference/2.3/analysis.html
# Note that this setting only takes effect on newly created indices.
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
elasticsearch_analyzer = standard

# Global request timeout for Elasticsearch requests (e. g. during search, index creation, or index time-range
# calculations) based on a best-effort to restrict the runtime of Elasticsearch operations.
# Default: 1m
#elasticsearch_request_timeout = 1m

# Global timeout for index optimization (force merge) requests.
# Default: 1h
#elasticsearch_index_optimization_timeout = 1h

# Maximum number of concurrently running index optimization (force merge) jobs.
# If you are using lots of different index sets, you might want to increase that number.
# Default: 20
#elasticsearch_index_optimization_jobs = 20

# Time interval for index range information cleanups. This setting defines how often stale index range information
# is being purged from the database.
# Default: 1h
#index_ranges_cleanup_interval = 1h

# Batch size for the Elasticsearch output. This is the maximum (!) number of messages the Elasticsearch output
# module will get at once and write to Elasticsearch in a batch call. If the configured batch size has not been
# reached within output_flush_interval seconds, everything that is available will be flushed at once. Remember
# that every outputbuffer processor manages its own batch and performs its own batch write calls.
# ("outputbuffer_processors" variable)
output_batch_size = 500

# Flush interval (in seconds) for the Elasticsearch output. This is the maximum amount of time between two
# batches of messages written to Elasticsearch. It is only effective at all if your minimum number of messages
# for this time period is less than output_batch_size * outputbuffer_processors.
output_flush_interval = 1

# As stream outputs are loaded only on demand, an output which is failing to initialize will be tried over and
# over again. To prevent this, the following configuration options define after how many faults an output will
# not be tried again for an also configurable amount of seconds.
output_fault_count_threshold = 5
output_fault_penalty_seconds = 30

# The number of parallel running processors.
# Raise this number if your buffers are filling up.
processbuffer_processors = 5
outputbuffer_processors = 3

#outputbuffer_processor_keep_alive_time = 5000
#outputbuffer_processor_threads_core_pool_size = 3
#outputbuffer_processor_threads_max_pool_size = 30

# UDP receive buffer size for all message inputs (e. g. SyslogUDPInput).
#udp_recvbuffer_sizes = 1048576

# Wait strategy describing how buffer processors wait on a cursor sequence. (default: sleeping)
# Possible types:
#  - yielding
#    Compromise between performance and CPU usage.
#  - sleeping
#    Compromise between performance and CPU usage. Latency spikes can occur after quiet periods.
#  - blocking
#    High throughput, low latency, higher CPU usage.
#  - busy_spinning
#    Avoids syscalls which could introduce latency jitter. Best when threads can be bound to specific CPU cores.
processor_wait_strategy = blocking

# Size of internal ring buffers. Raise this if raising outputbuffer_processors does not help anymore.
# For optimum performance your LogMessage objects in the ring buffer should fit in your CPU L3 cache.
# Must be a power of 2. (512, 1024, 2048, ...)
ring_size = 65536

inputbuffer_ring_size = 65536
inputbuffer_processors = 2
inputbuffer_wait_strategy = blocking

# Enable the disk based message journal.
message_journal_enabled = true

# The directory which will be used to store the message journal. The directory must me exclusively used by Graylog and
# must not contain any other files than the ones created by Graylog itself.
#
# ATTENTION:
#  If you create a seperate partition for the journal files and use a file system creating directories like 'lost+found'
#  in the root directory, you need to create a sub directory for your journal.
#  Otherwise Graylog will log an error message that the journal is corrupt and Graylog will not start.
message_journal_dir = /var/lib/graylog-server/journal

# Journal hold messages before they could be written to Elasticsearch.
# For a maximum of 12 hours or 5 GB whichever happens first.
# During normal operation the journal will be smaller.
#message_journal_max_age = 12h
#message_journal_max_size = 5gb

#message_journal_flush_age = 1m
#message_journal_flush_interval = 1000000
#message_journal_segment_age = 1h
#message_journal_segment_size = 100mb

# Number of threads used exclusively for dispatching internal events. Default is 2.
#async_eventbus_processors = 2

# How many seconds to wait between marking node as DEAD for possible load balancers and starting the actual
# shutdown process. Set to 0 if you have no status checking load balancers in front.
lb_recognition_period_seconds = 3

# Journal usage percentage that triggers requesting throttling for this server node from load balancers. The feature is
# disabled if not set.
#lb_throttle_threshold_percentage = 95

# Every message is matched against the configured streams and it can happen that a stream contains rules which
# take an unusual amount of time to run, for example if its using regular expressions that perform excessive backtracking.
# This will impact the processing of the entire server. To keep such misbehaving stream rules from impacting other
# streams, Graylog limits the execution time for each stream.
# The default values are noted below, the timeout is in milliseconds.
# If the stream matching for one stream took longer than the timeout value, and this happened more than "max_faults" times
# that stream is disabled and a notification is shown in the web interface.
#stream_processing_timeout = 2000
#stream_processing_max_faults = 3

# Length of the interval in seconds in which the alert conditions for all streams should be checked
# and alarms are being sent.
#alert_check_interval = 60

# Since 0.21 the Graylog server supports pluggable output modules. This means a single message can be written to multiple
# outputs. The next setting defines the timeout for a single output module, including the default output module where all
# messages end up.
#
# Time in milliseconds to wait for all message outputs to finish writing a single message.
#output_module_timeout = 10000

# Time in milliseconds after which a detected stale master node is being rechecked on startup.
#stale_master_timeout = 2000

# Time in milliseconds which Graylog is waiting for all threads to stop on shutdown.
#shutdown_timeout = 30000

# MongoDB connection string
# See https://docs.mongodb.com/manual/reference/connection-string/ for details
mongodb_uri = mongodb://graylog:[email protected]:27017,10.2.2.42:27017,10.2.2.43:27017/graylog?replicaSet=rs0

# Authenticate against the MongoDB server
#mongodb_uri = mongodb://grayloguser:secret@localhost:27017/graylog

# Use a replica set instead of a single host
#mongodb_uri = mongodb://grayloguser:secret@localhost:27017,localhost:27018,localhost:27019/graylog

# Increase this value according to the maximum connections your MongoDB server can handle from a single client
# if you encounter MongoDB connection problems.
mongodb_max_connections = 1000

# Number of threads allowed to be blocked by MongoDB connections multiplier. Default: 5
# If mongodb_max_connections is 100, and mongodb_threads_allowed_to_block_multiplier is 5,
# then 500 threads can block. More than that and an exception will be thrown.
# http://api.mongodb.com/java/current/com/mongodb/MongoOptions.html#threadsAllowedToBlockForConnectionMultiplier
mongodb_threads_allowed_to_block_multiplier = 5

# Drools Rule File (Use to rewrite incoming log messages)
# See: http://docs.graylog.org/en/2.1/pages/drools.html
#rules_file = /etc/graylog/server/rules.drl

# Email transport
#transport_email_enabled = false
#transport_email_hostname = mail.example.com
#transport_email_port = 587
#transport_email_use_auth = true
#transport_email_use_tls = true
#transport_email_use_ssl = true
#transport_email_auth_username = [email protected]
#transport_email_auth_password = secret
#transport_email_subject_prefix = [graylog]
#transport_email_from_email = [email protected]

# Specify and uncomment this if you want to include links to the stream in your stream alert mails.
# This should define the fully qualified base url to your web interface exactly the same way as it is accessed by your users.
#transport_email_web_interface_url = https://graylog.example.com

# The default connect timeout for outgoing HTTP connections.
# Values must be a positive duration (and between 1 and 2147483647 when converted to milliseconds).
# Default: 5s
#http_connect_timeout = 5s

# The default read timeout for outgoing HTTP connections.
# Values must be a positive duration (and between 1 and 2147483647 when converted to milliseconds).
# Default: 10s
#http_read_timeout = 10s

# The default write timeout for outgoing HTTP connections.
# Values must be a positive duration (and between 1 and 2147483647 when converted to milliseconds).
# Default: 10s
#http_write_timeout = 10s

# HTTP proxy for outgoing HTTP connections
#http_proxy_uri =

# Disable the optimization of Elasticsearch indices after index cycling. This may take some load from Elasticsearch
# on heavily used systems with large indices, but it will decrease search performance. The default is to optimize
# cycled indices.
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#disable_index_optimization = true

# Optimize the index down to <= index_optimization_max_num_segments. A higher number may take some load from Elasticsearch
# on heavily used systems with large indices, but it will decrease search performance. The default is 1.
#
# ATTENTION: These settings have been moved to the database in Graylog 2.2.0. When you upgrade, make sure to set these
#            to your previous settings so they will be migrated to the database!
#index_optimization_max_num_segments = 1

# The threshold of the garbage collection runs. If GC runs take longer than this threshold, a system notification
# will be generated to warn the administrator about possible problems with the system. Default is 1 second.
#gc_warning_threshold = 1s

# Connection timeout for a configured LDAP server (e. g. ActiveDirectory) in milliseconds.
#ldap_connection_timeout = 2000

# Disable the use of SIGAR for collecting system stats
#disable_sigar = false

# The default cache time for dashboard widgets. (Default: 10 seconds, minimum: 1 second)
#dashboard_widget_default_cache_time = 10s

# Automatically load content packs in "content_packs_dir" on the first start of Graylog.
#content_packs_loader_enabled = true

# The directory which contains content packs which should be loaded on the first start of Graylog.
content_packs_dir = /usr/share/graylog-server/contentpacks

# A comma-separated list of content packs (files in "content_packs_dir") which should be applied on
# the first start of Graylog.
# Default: empty
content_packs_auto_load = grok-patterns.json

# For some cluster-related REST requests, the node must query all other nodes in the cluster. This is the maximum number
# of threads available for this. Increase it, if '/cluster/*' requests take long to complete.
# Should be rest_thread_pool_size * average_cluster_size if you have a high number of concurrent users.
proxied_requests_thread_pool_size = 32

启动graylog服务：

$ sudo chkconfig --add graylog-server
$ sudo systemctl daemon-reload
$ sudo systemctl enable graylog-server.service
$ sudo systemctl start graylog-server.service