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This article is a detailed introduction to "how to configure keepalived dual hot standby nginx". The content is detailed, the steps are clear, and the details are properly handled. I hope this article "how to configure keepalived dual hot standby nginx" can help you solve your doubts. Let's go deeper and learn new knowledge together with the ideas of Xiaobian.

Environmental preparation:

2 centos: 192.168.0.105 and 192.168.0.118, virtual ip(vip) is 192.168.0.119

Configure keepavlived

Install keepalived on 105 and 118 respectively

yum install keepalived

Get ready for the heartbeat.

Keepalived configuration is quite flexible, you can regularly execute the corner command, used for heartbeat check, for example, we visit nginx found nginx inaccessible, turn off keepalived, thus switching to nginx to achieve uninterrupted service support.

vi /etc/keepalived/keepalived.conf

#!/ bin/bashcount=0for (( k=0; k state backup，priority 100 -> priority 90，mcast_src_ip 192.168.0.118 -> mcast_src_ip 192.168.0.105。Everything else remains the same, isn't it simple?

! configuration file for keepalivedvrrp_script chk_nginx { script "/etc/keepalived/check_nginx.sh" interval 2 weight -5}vrrp_instance vi_1 { state backup #modified interface eth0 mcast_src_ip 192.168.0.105 #modified to native ip virtual_router_id 51 priority 90 #number word reduced advert_int 2 authentication { auth_type pass auth_pass 1111 } virtual_ipaddress {192.168.0.119} track_script { chk_nginx }}

Here, the simple configuration of keepalived is completed. Below, start keepalived.

service keepalived start

install Nginx

Check if nginx dependency libraries are complete

rpm -qa zlibrpm -qa zlib-develrpm -qa opensslrpm -qa openssl-develrpm -qa pcrerpm -qa pcre-develrpm -qa gcc

If not, install it.

yum -y install gcc zlib zlib-devel openssl openssl-devel pcre-devel

Download and extract nginx

mkdir nginxsrccd nginxsrc/

wget http://nginx.org/download/nginx-1.13.9.tar.gztar zxvf nginx-1.13.9.tar.gzcd nginx-1.13.9/

./ configure --prefix=/usr/local/nginx --with-http_ssl_module --with-http_stub_status_module --with-http_realip_module

The requested URL/usr/local/nginx/sbin/nginx was not found on this server.

make&&make install

After successful execution, the leaving directory will be displayed.

start

/usr/local/nginx/sbin/nginx

check

ps aux|grep nginx

startup

vi /etc/rc.local

add a line

/usr/local/nginx/sbin/nginx

Because port 80 on my machine is occupied by other applications, I modified nginx.conf for 105 and 118 to change port 80 to 81.

vi /usr/local/nginx/conf/nginx.conf

Add an ip to the index.html on 105 and 119 so they can identify which ip is open.

vi /usr/local/nginx/html/index.html

nginx reload configuration

/usr/local/nginx/sbin/nginx -s reload

All right, let's interview

curl 192.168.0.119:81

The html returned is index.html on 118 machines

Now we put 118 nginx stop

/usr/local/nginx/sbin/nginx -s stop

At this time, keepalived heartbeat check on 118. If nginx cannot be accessed, it will turn keepalived off and then turn to the slave node.

Let's go back to 119.

curl 192.168.0.119:81

Restart nginx and keepalived on 118

The URL returned by visiting 119 is index.html on 118.

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