Keepalived+nginx+apache Main and double-live building test

The Keepalived+nginx is available in both master and dual-active modes. Master and Standby mode to provide a VIP, while only one server to work, the other for the standby machine, the two-way external to provide two VIP, both machines for backup, the following detailed instructions to build the test steps.

Main Standby mode

Architecture diagram:

Configuration:

Host	Ip	Operating system	Software	Note
nginx01	172.27.9.91	Centos7	Nginx Port 82 Keepalived	Shutting down firewalls and Selinu
nginx02	172.27.9.92	Centos7	Nginx Port 82 Keepalived	Shutting down firewalls and Selinu
Web01	172.27.9.125	Centos7	Apache Port 1180	Shutting down firewalls and Selinu
Web02	172.27.9.126	Centos7	Apache Port 1180	Shutting down firewalls and Selinu

1.nginx Installation

NGINX01 and nginx02 installation nginx See CENTOS7 installation Nginx

2.nginx Configuration

The two Nginx servers are configured identically, as follows:

[[Email protected] ~]# more /usr/local/nginx/conf/nginx.conf#user  nobody;worker _processes  1; #error_log   logs/error.log; #error_log   logs/error.log   Notice, #error_log   logs/error.log  info; #pid          logs/nginx.pid;events {    worker_connections  1024;} 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   logs/access.log  main;    sendfile         on;     #tcp_nopush       on;     #keepalive_timeout   0;    keepalive_timeout   65;     #gzip   on;    upstream webser{              server 172.27.9.125:1180;              server 172.27.9.126:1180;            }    server {         listen       82;         server_name  localhost;         #charset  koi8-r;          #access_log   logs/host.access.log  main;         location / {             proxy_pass http://webser;              #root    html;              #index   index.html index.htm;         }        error_page   500 502 503 504   /50x.html;        location = /50x.html {             root   html;         }    }}[[email protected] ~]# 

3.keepalived Installation

Install the keepalived on nginx01 and nginx02 respectively:

[Email protected] ~]# yum-y install keepalived

4.keepalived Configuration

NGINX01 on keepalived configuration:

[[email protected] keepalived]# more keepalived.conf! configuration file  for keepalivedglobal_defs {   notification_email {      [Email protected]     [email protected]     [email  protected]   }   notification_email_from [email protected]     #smtp_server  192.168.200.1    #smtp_connect_timeout  30    router_id proxy1 }vrrp_script chk_nginx {  script  "/etc/keepalived/check_ Nginx.sh "  interval 2  weight 20  fall 1  rise 10} Vrrp_instance vi_1 {    state master     interface  ens33    virtual_router_id 51    priority 100     advert_int 1    authentication {         auth_type pass        auth_pass 1111     }    virtual_ipaddress {        172.27.9.200     }    track_script {         chk_nginx    }}

Keepalived configuration on nginx02:

[[email protected] keepalived]# more keepalived.conf! configuration file  for keepalivedglobal_defs {   notification_email {      [Email protected]     [email protected]     [email  protected]   }   notification_email_from [email protected]     #smtp_server  192.168.200.1    #smtp_connect_timeout  30    router_id proxy2}vrrp_script chk_nginx {  script  "/etc/keepalived/check_nginx.sh "  interval 2  weight 20   fall 2  rise 1} Vrrp_instance vi_1 {    state backup     interface  ens33    virtual_router_id 51    priority 90     advert_int 1    authentication {         auth_type pass        auth_pass 1111     }    virtual_ipaddress {        172.27.9.200     }    track_script {         chk_nginx    }}

check_nginx.sh script:

[Email protected] keepalived]# more check_nginx.sh #!/bin/basha= ' ps-c nginx--no-header |wc-l ' If [$A-eq 0];then /usr/local/nginx/sbin/nginx if [' Ps-c nginx--no-header |wc-l '-eq 0];then Pkill Keep Fifi

The script user detects if the Nginx process is present, restarts if it does not exist, and kills the keepalived process directly if the reboot fails, triggering the switchover. (If not pkill command please install first)

5.apache Installation

Install the Apache configuration on WEB01 and WEB02 separately:

[[email protected] ~]# yum-y install http[[email protected] ~]# systemctl start httpd[[email protected] ~]# systemctl ENA ble httpd[[email protected]/]# echo web01-172.27.9.125 >/var/www/html/index.html[[email protected]/]# Echo web02-172.27.9.126 >/var/www/html/index.html

Modify the Apache default port, respectively, with 80 change to 1180:

[Email protected]/]# View/etc/httpd/conf/httpd.conflisten 1180

6. Start the service

Launch two server nginx and keepalived services.

[[email protected] ~]# Nginx[[email protected] ~]# service keepalived startredirecting to/bin/systemctl start keepalived . Service

7. Highly Available tests

Page Access http://172.27.9.200:82/

VIP View:

The VIP is found on the nginx01, at which time the nginx01,nginx02 is used as a backup for the external service. Stop the keepalived service on the NGINX01 and trigger the switchover.

[[email protected] ~]# pkill keep[[email protected] ~]# ps-ef|grep keeproot 11389 2172 0 16:56 pts/0 00:00:00 grep--color=auto Keep

At this point VIP switch to nginx02, refresh page access http://172.27.9.200:82/

Discover access to the VIP or polling to access the backend Web server, at this time the external server is nginx02,nginx01 equivalent to a downtime state.

Dual Live Mode

Architecture diagram:

Configuration:

Host	Ip	Operating system	Software	Vip
nginx01	172.27.9.91	Centos7	Nginx Port 82 Keepalived	172.27.9.200
nginx02	172.27.9.92	Centos7	Nginx Port 82 Keepalived	172.27.9.210
Web01	172.27.9.125	Centos7	Apache Port 1180	/
Web02	172.27.9.126	Centos7	Apache Port 1180	/

1.keepalived Configuration

NGINX01 on keepalived configuration:

[[Email protected] ~]# more /etc/keepalived/keepalived.conf! configuration file  for keepalivedglobal_defs {   notification_email {      [email protected]     [email protected]      [Email protected]   }   notification_email_from [email protected]     #smtp_server  192.168.200.1    #smtp_connect_timeout  30    router_id proxy1 }vrrp_script chk_nginx {  script  "/etc/keepalived/ Check_nginx.sh "  interval 2  weight 20  fall 1  rise  10}vrrp_instance VI_1 {    state MASTER     interface ens33    virtual_router_id 51    priority 100     advert_int 1    authentication {         auth_type pass        auth_pass 1111     }    virtual_ipaddress {        172.27.9.200     }    track_script {         chk_nginx    }}vrrp_instance VI_2 {    state  backup     interface ens33    virtual_router_id 52     priority 90    advert_int 1     authentication {        auth_type pass         auth_pass 1111    }    virtual_ ipaddress {        172.27.9.210    }    track_script  {        chk_nginx    }}

nginx02 on keepalived configuration:

[[Email protected] ~]# more /etc/keepalived/keepalived.conf! configuration file  for keepalivedglobal_defs {   notification_email {      [email protected]     [email protected]      [Email protected]   }   notification_email_from [email protected]     #smtp_server  192.168.200.1    #smtp_connect_timeout  30    router_id proxy2}vrrp_script chk_nginx {  script  "/etc/keepalived/check_ Nginx.sh "  interval 2  weight 20  fall 2  rise 1} Vrrp_instance vi_1 {    state backup     interface  ens33    virtual_router_id 51    priority 90     advert_int 1    authentication {         auth_type pass        auth_pass 1111     }    virtual_ipaddress {        172.27.9.200     }    track_script {         chk_nginx    }}vrrp_instance VI_2 {    state  master    interface ens33    virtual_router_id 52     priority 100    advert_int 1     authentication {        auth_type pass         auth_pass 1111    }    virtual_ ipaddress {        172.27.9.210    }    track_script {         chk_nginx    }}

After modifying the keepalived configuration, restart the keepalived service separately:

[Email protected] ~]# service keepalived restart

2.VIP View

NGINX01:

NGINX02:

3. Page access:

vip1:http://172.27.9.200:82/

vip2:http://172.27.9.210:82/

Discover Vip1 and VIP2 to access the Web server in polling mode, respectively

4. Highly Available tests

At this time vip1 on the nginx01, vip2 on the nginx02, the two servers each other to provide services for the first time. Now stop the keepalived service on the nginx01, simulate the outage and trigger the switchover.

[[email protected] ~]# pkill keep[[email protected] ~]# ps-ef|grep keeproot 13688 2172 0 17:22 pts/0 00:00:00 grep--color=auto Keep

Page access:

vip1:http://172.27.9.200:82/

vip2:http://172.27.9.210:82/

Vip1 and VIP2 are found to have access to the Web service properly. VIP View:

NGINX01:

NGINX02:

Found Vip1 drift to vip2,nginx02 take over nginx01 vip1, at this time nginx02 alone to provide services.

Summarize:

1. Primary and Standby mode to provide only one VIP, access convenient, but at the same time only one server external services;

2. Double Live mode provides two VIP, access is troublesome, but at the same time two servers provide services externally;

3. High-availability operation in both primary and Standby mode.

Keepalived+nginx+apache Main and double-live building test