Nginx + Keepalived load balancing high availability (dual-machine Hot Backup), nginxkeepalived

Nginx + Keepalived load balancing high availability (dual-machine Hot Backup), nginxkeepalived
Nginx + Keepalived load balancing high availability (dual-machine Hot Backup)
1.1 Nginx installation and configuration
1.2 install and configure Keepalived
1.3 install WebServer
1.4 test Nginx + Keepalived

The environment is as follows:
CentOS 6.4 _ 64 K
Eepalived-1.2.12
Nginx-1.4.4
Vip: 192.168.10.50
Master: 192.168.10.11
Backup: 192.168.10.12
Webserver1: 192.168.10.13
Webserver2: 192.168.10.14

1.1 Nginx installation and configuration
A. Install Nginx on 192.168.10.11 and 192.168.10.12 respectively (refer to the Nginx installation Documentation)
B. Modify the Nginx configuration files on 192.168.10.11 and 192.168.10.12 as follows:

User wwwwww;
Worker_processes 8;
Pid/usr/local/nginx/logs/nginx. pid;
Worker_rlimit_nofile 51200;
Events {

Use epoll;
Worker_connections 51200;

}
Http {

Include mime. types;
Default_type application/octet-stream;
Log_format main '$ remote_addr-$ remote_user [$ time_local] "$ request "'
'$ Status $ body_bytes_sent "$ http_referer "'
'"$ Http_user_agent" "$ http_x_forwarded_for "';
Access_log/usr/local/nginx/logs/access. log main;
Sendfile on;
Keepalive_timeout 65;
Client_header_buffer_size 32 k;
Large_client_header_buffers 432 k;
Client_max_body_size 10 m;
Gzip on;
Gzip_min_length 1 k;
Gzip_buffers 416 k;
Gzip_http_version 1.1;
Gzip_comp_level 5;
Gzip_disable "MSIE [1-6] \.";
Gzip_vary on;
Gzip_types text/plainapplication/x-javascripttext/cssapplication/xml;
Upstreambackend {

# Ip_hash; # comment out during testing

Server192.168.10.13: 80;

Server192.168.10.14: 80;

}

Server {

Listen 80;

Server_name localhost;

Location /{

Proxy_redirect off;

Proxy_set_header Host $ host;

Proxy_set_header X-Real-IP $ remote_addr;

Proxy_set_header X-Forwarded-For $ proxy_add_x_forwarded_for;

Proxy_pass http: // backend;

}

}

}


1.2 install and configure Keepalived
A. Install Keepalived on 192.168.10.11 and 192.168.10.12 respectively (refer to the Keepalived installation documentation ).
B. Modify the/etc/keepalived. conf file on 192.168.10.11 as follows:
Global_defs {

Notification_email {

1244918797@qq.com

}
Notification_email_fromtest@baba.io
Smtp_server 127.0.0.1
Smtp_connect_timeout 30
Router_idLVS_DEVEL

}
Vrrp_instanceVI_1 {

State BACKUP
Interface eth0
Virtual_router_id 100
Priority200
Advert_int 1
Nopreempt
Authentication {

Auth_type PASS

Auth_pass 123456

}
Virtual_ipaddress {

192.168.10.50

}

}
C. Modify the/etc/keepalived. conf file on 192.168.10.12, as shown below:
Global_defs {

Notification_email {

1244918797@qq.com

}
Notification_email_fromtest@baba.io
Smtp_server 127.0.0.1
Smtp_connect_timeout 30
Router_id LVS_DEVEL

}
Vrrp_instanceVI_1 {

State BACKUP
Interface eth0
Virtual_router_id 100
Priority200
Advert_int 1
Nopreempt
Authentication {

Auth_type PASS

Auth_pass 123456

}
Virtual_ipaddress {

192.168.10.50

}

}
D. Write a SHELL script on 192.168.10.11 and 192.168.10.12 to check whether Nginx works normally.
Stop Keepalived.
[Root @ localhost ~] # Vim/root/shell/nginx_check.sh
#! /Bin/bash
While:
Do

Nginxcheck = 'ps-cngcheck -- no-header | wc-l'
Keepalivedcheck = 'ps-Ckeepalived -- no-header | wc-l'
If [$ nginxcheck-eq0]; then

If [$ keepalivedcheck-ne0]; then

/Etc/init. d/keepalivedstop

Else

Echo "keepalivedisstoped"

Fi

Elif [$ keepalivedcheck-eq0]; then

/Etc/init. d/keepalivedstart

Fi
Sleep 5

Done

E. Set automatic execution upon startup
[Root @ localhost ~] # Echo "nohupsh/root/shell/nginx_check.sh &">/etc/rc. local

1.3 install WebServer
For ease of demonstration, only Apache (Tomcat and Resin can be installed) is installed on WebServer to provide Web
Service.
A. install Apache on 192.168.10.13 and set the homepage content as your IP address.
[Root @ localhost ~] # Yum install httpd
[Root @ localhost ~] # Echo "[Root @ localhost ~] # Service httpd start
B. install Apache on 192.168.10.14 and set the homepage content as your IP address.
[Root @ localhost ~] # Yum install httpd
[Root @ localhost ~] # Echo "[Root @ localhost ~] # Service httpd start


1.4 test Nginx + Keepalived
After completing the preceding steps, the cluster environment has been set up. Next, we will test whether the cluster environment is normal.
A. Start Nginx and enable monitoring on 192.168.10.11 and 192.168.10.12 respectively.
[Root @ localhost ~] #/Usr/local/nginx/sbin/nginx
[Root @ localhost ~] # Nohupsh/root/shell/nginx_check.sh &
B. the test method is as follows:
1) Open the browser, enter 192.168.10.50, and check whether "192.163.10.13" or "192.163.10.14" is displayed again"
2) Disable Nginx on 192.168.10.11 and check whether the Web Service is normal.
3) Disable Nginx on 192.168.10.12 and start Nginx on 192.168.10.11. Is the Web Service normal?
4) Disable Apahce on 192.168.10.13 and check whether the Web Service is normal.