Implementation process of nginx high availability cluster

This article mainly introduces the implementation process of nginx high-availability cluster. The example code in this article is very detailed and has a certain reference value for everyone's study or work. Friends in need can refer to it.

1. Configuration:

(1) Two nginx servers are required (2) Keepalived is required (3) A virtual IP is required

2. Preparation for high availability configuration

(1) Two servers are required: 192.168.180.113 and 192.168.180.112 (2) Install nginx on both servers (3) Install keepalived on both servers

3. Install keepalived on two servers

(1) Install using the yum command

(2) After installation, a directory called keepalived is created in etc, and a file called keepalived.conf is created.

[root@topcheer dev]# yum install keepalived -y
Loaded plugins: fastestmirror, langpacks
Loading mirror speeds from cached hostfile
 * base: mirrors.cn99.com
 * epel: ftp.riken.jp
 * extras: mirrors.cn99.com
 * updates: mirror.lzu.edu.cn
gitlab_gitlab-ce/x86_64/signature | 836 B 00:00:00
gitlab_gitlab-ce/x86_64/signature | 1.0 kB 00:00:00 !!!
gitlab_gitlab-ce-source/signature | 836 B 00:00:00
gitlab_gitlab-ce-source/signature | 951 B 00:00:00 !!!
Resolving dependencies--> Checking transactions---> Package keepalived.x86_64.0.1.3.5-16.el7 will be installed--> Processing dependency libnetsnmpmibs.so.31()(64bit), which is needed by package keepalived-1.3.5-16.el7.x86_64--> Processing dependency libnetsnmpagent.so.31()(64bit), which is needed by package keepalived-1.3.5-16.el7.x86_64--> Checking transactions---> Package net-snmp-agent-libs.x86_64.1.5.7.2-43.el7 will be installed--> Dependency resolution completed
Dependency resolution
==========================================================================================================================================
 Package Architecture Version Source Size === ...
Installing:
 keepalived x86_64 1.3.5-16.el7 base 331 k
Install for dependencies:
 net-snmp-agent-libs x86_64 1:5.7.2-43.el7 base 706 k

Transaction Summary= ...
Install 1 package (+1 dependent package)

Total downloads: 1.0M
Installation size: 3.0 M
Downloading packages:
(1/2): net-snmp-agent-libs-5.7.2-43.el7.x86_64.rpm | 706 kB 00:00:00
(2/2): keepalived-1.3.5-16.el7.x86_64.rpm | 331 kB 00:00:00
------------------------------------------------------------------------------------------------------------------------------------------
Total 1.8 MB/s | 1.0 MB 00:00:00
Running transaction check
Running transaction test
Transaction test succeeded
Running transaction
 Installing: 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64 1/2
 Installing: keepalived-1.3.5-16.el7.x86_64 2/2
 Verifying: keepalived-1.3.5-16.el7.x86_64 1/2
 Verifying: 1:net-snmp-agent-libs-5.7.2-43.el7.x86_64 2/2

Installed:
 keepalived.x86_64 0:1.3.5-16.el7

Installed as a dependency:
 net-snmp-agent-libs.x86_64 1:5.7.2-43.el7

complete!

4. Modify the configuration file

Both need to be replaced, one master and one slave

[root@topcheer keepalived]# cat keepalived.conf
global_defs {
  notification_email {
  [email protected]
  [email protected]
  [email protected]
  }
  notification_email_from [email protected]
  smtp_server 192.168.180.113
  smtp_connect_timeout 30
  router_id LVS_DEVEL
  }
  vrrp_script chk_http_port {
  script "/usr/local/src/nginx_check.sh"
  interval 2 # (interval between detection script execution)
  weight 2
  }
  vrrp_instance VI_1 {
   state BACKUP # Change MASTER to BACKUP on the backup server
   interface ens33 //Network card virtual_router_id 51 # The virtual_router_id of the master and backup machines must be the same priority 40 # The master and backup machines have different priorities, the master has a larger value and the backup has a smaller value advert_int 1
  authentication
   auth_type PASS
   auth_pass 1111
  }
  virtual_ipaddress {
  192.168.180.114 // VRRP H virtual address}
}

script:

[root@topcheer src]# cat nginx_check.sh
#!/bin/bash
A=`ps -C nginx ▒Cno-header |wc -l`
if [ $A -eq 0 ];then
  /usr/local/nginx/sbin/nginx
  sleep 2
  if [ `ps -C nginx --no-header |wc -l` -eq 0 ];then
    killall keepalived
  fi
fi[root@topcheer src]#

Start nginx and keepalived on both servers

Start nginx: ./nginx Since I installed gitlab's own nginx on 112, I don't need to start it. Start keepalived: systemctl start keepalived.service

5. Testing

Turn off nginx and keepalived on 113 and find that it will switch to 112

The above is the full content of this article. I hope it will be helpful for everyone’s study. I also hope that everyone will support 123WORDPRESS.COM.

You may also be interested in:

Keepalived+Nginx+Tomcat sample code to implement high-availability Web cluster
Nginx implements high availability cluster construction (Keepalived+Haproxy+Nginx)

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