ELK部署生产实践部署（1）
ELK部署生产实践部署（1）具体文档参照我的笔记
### 日志采集前规范解决事项：
1、开发人员不能登录线上服务器查看详细日志。
2、各个系统都有日志，日志数据分散难以查找。
3、日志数据量大、查询速度慢
4、日志数据大量延迟
5、服务器时间不同步，导致日期错误
### 解决问题
1. 方便快速查看各种日志
2. 故障发生，处理故障时才去查看日志，没有完整的日志告警机制
3. 节点多、日志分散、收集日志难度加大、没有统一规范存取路径
4. 运行日志、错误日志、需要固定存放位置
###
部署环境
# cat /etc/redhat-release
CentOS Linux release 7.0.1406 (Core)
### ELKstack
- [ ] 运行流程： 收集--->>存储 ----->>搜索+统计+展示------->>报警，数据分析
### Elastic Serch 是一个基于Lucene搜索服务器，提供了一个分布式多用户能力的全文搜索引擎。
### ES特点
- [ ] cluster集群
- 集群中有多个节点，其中有一个为主节点，这个主节点是可以通过选举产生的，主节点是对于集群内部管理的。
## ELKsatack介绍，架构图如下
- 对于日志来说，最常见的需求就是收集、存储、查询、展示，开源社区正好有相对应的开源项目：logstash（收集）、elasticsearch（存储+搜索）、kibana（展示），我们将这三个组合起来的技术称之为ELKStack，所以说ELKStack指的是Elasticsearch、Logstash、Kibana技术栈的结合，一个通用的架构如下图所示：
!(http://note.youdao.com/yws/api/personal/file/910BE9E6CA6F4D90B8A709959FBF34D7?method=download&shareKey=b54685b1119f1d6c39403b71f7d96eb7)
## ElkStack部署
#### Elasticsearch、需要Java环境，所以直接使用yum安装。
1. 安装java、并检查是否安装成功
```
#yum install java -y
# java -version
openjdk version "1.8.0_131"
OpenJDK Runtime Environment (build 1.8.0_131-b12)
OpenJDK 64-Bit Server VM (build 25.131-b12, mixed mode)
#
```
2. 下载并安装GPG key
# rpm --import https://packages.elastic.co/GPG-KEY-elasticsearch
3. 编辑yum仓库
# vim /etc/yum.repos.d/elasticsearch.repo
name=Elasticsearch repository for 2.x packages
baseurl=http://packages.elastic.co/elasticsearch/2.x/centos
gpgcheck=1
gpgkey=http://packages.elastic.co/GPG-KEY-elasticsearch
enabled=1
4. yum安装需要配置limits
# vim /etc/security/limits.conf
elasticsearch soft memlock unlimited
elasticsearch hard memlock unlimited
5. 安装ElasticSearch
# yum install -y elasticsearch logstash kibana
## 配置Elasticsearch
# vim /etc/elasticsearch/elasticsearch.yml
# mkdir -p /data/es-data ##创建存放目录
cluster.name: elkcluster##集群名称
node.name: elk-server01 ##节点名称
path.data: /data/es-data##修改目录存放路径
path.logs: /var/log/elasticsearch/ ##修改日志存放路径
bootstrap.memory_lock: true 不使用交换分区，锁住内存
network.host: 172.16.1.200 监听主机
http.port: 9200 打开监听端口
### 查看更改配置文件的内容
# grep '^' /etc/elasticsearch/elasticsearch.yml
cluster.name: elkcluster
node.name: elk-server01
path.data: /data/es-data
path.logs: /var/log/elasticsearch/
bootstrap.memory_lock: true
network.host: 172.16.1.200
http.port: 9200
action.destructive_requires_name: false
discovery.zen.ping.unicast.hosts: ["172.16.1.200", "172.16.1.201"]
#
### 启动elasticsearch
```
#systemctl start elasticsearch
### 查看启动状态、启动失败
#systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; disabled; vendor preset: disabled)
Active: failed (Result: exit-code) since Mon 2017-06-26 14:52:39 EDT; 2s ago
Docs: http://www.elastic.co
Process: 20760 ExecStart=/usr/share/elasticsearch/bin/elasticsearch -Des.pidfile=${PID_DIR}/elasticsearch.pid -Des.default.path.home=${ES_HOME} -Des.default.path.logs=${LOG_DIR} -Des.default.path.data=${DATA_DIR} -Des.default.path.conf=${CONF_DIR} (code=exited, status=1/FAILURE)
Process: 20759 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS)
Main PID: 20760 (code=exited, status=1/FAILURE)
Jun 26 14:52:39 master_agent elasticsearch: at org.elasticsearch.bootstrap.Security.createPermissions(Security.java:212)
Jun 26 14:52:39 master_agent elasticsearch: at org.elasticsearch.bootstrap.Security.configure(Security.java:118)
Jun 26 14:52:39 master_agent elasticsearch: at org.elasticsearch.bootstrap.Bootstrap.setupSecurity(Bootstrap.java:212)
Jun 26 14:52:39 master_agent elasticsearch: at org.elasticsearch.bootstrap.Bootstrap.setup(Bootstrap.java:183)
Jun 26 14:52:39 master_agent elasticsearch: at org.elasticsearch.bootstrap.Bootstrap.init(Bootstrap.java:286)
Jun 26 14:52:39 master_agent elasticsearch: at org.elasticsearch.bootstrap.Elasticsearch.main(Elasticsearch.java:45)
Jun 26 14:52:39 master_agent elasticsearch: Refer to the log for complete error details.
Jun 26 14:52:39 master_agent systemd: elasticsearch.service: main process exited, code=exited, status=1/FAILURE
Jun 26 14:52:39 master_agent systemd: Unit elasticsearch.service entered failed state.
Jun 26 14:52:39 master_agent systemd: elasticsearch.service failed.
#
### 解决办法
- 查看日志
- # tail -100 /var/log/elasticsearch/elkcluster.log
- 修改目录所属权限
- # chown -R elasticsearch:elasticsearch /data/es-data/
### 查看启动
#systemctl start elasticsearch
#systemctl status elasticsearch
● elasticsearch.service - Elasticsearch
Loaded: loaded (/usr/lib/systemd/system/elasticsearch.service; disabled; vendor preset: disabled)
Active: active (running) since Mon 2017-06-26 14:56:06 EDT; 2s ago
Docs: http://www.elastic.co
Process: 20802 ExecStartPre=/usr/share/elasticsearch/bin/elasticsearch-systemd-pre-exec (code=exited, status=0/SUCCESS)
Main PID: 20803 (java)
CGroup: /system.slice/elasticsearch.service
└─20803 /bin/java -Xms256m -Xmx1g -Djava.awt.headless=true -XX:+UseParNewGC -XX:+UseConcMarkSweepGC -XX:CMSInitiatingOccupancyFrac...
### 检查端口是否开启
#systemctl restart elasticsearch
# ss -ntlp
State Recv-Q Send-Q Local Address:Port Peer Address:Port
LISTEN 0 50 *:3306 *:* users:(("mysqld",19594,14))
LISTEN 0 128 *:22 *:* users:(("sshd",1372,3))
LISTEN 0 50 ::ffff:172.16.1.201:9200 :::* users:(("java",21205,91))
LISTEN 0 50 ::ffff:172.16.1.201:9300 :::* users:(("java",21205,79))
LISTEN 0 128 :::22 :::* users:(("sshd",1372,4))
#
### 浏览器访问查看下结果
http://172.16.1.201:9200/
内容如下：
{
"name" : "elk-server01",
"cluster_name" : "elkcluster",
"cluster_uuid" : "bkJEwJGARXq2Ki2xWa0oTQ",
"version" : {
"number" : "2.4.6",
"build_hash" : "5376dca9f70f3abef96a77f4bb22720ace8240fd",
"build_timestamp" : "2017-07-18T12:17:44Z",
"build_snapshot" : false,
"lucene_version" : "5.5.4"
},
"tagline" : "You Know, for Search"
}
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