Complete steps to achieve high availability with nginx combined with keepalived
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Preface In order to meet the high availability of the system, it is generally necessary to build a cluster. When the host crashes, our system can continue to provide services. The same is true when we use nginx as a reverse proxy and dynamic and static separation server. Achieving high availability of the system is the focus of our programmers. This article introduces how to use nginx and keepalived to build a high-availability cluster in master-slave mode. Prerequisite Knowledge This article does not introduce too much about nginx configuration, and assumes that readers already have some knowledge about nginx. Introduction of keepalived The function of Keepalived is to detect the status of the server. If a web server goes down or fails to work, Keepalived will detect it and remove the faulty server from the system, and use other servers to replace the server. When the server works normally, Keepalived automatically adds the server to the server group. All these tasks are completed automatically without human intervention. The only thing that needs to be done manually is to repair the faulty server. System architecture diagram
Implementation steps 1. Environment Configuration 1.1 Install nginx Install related dependencies yum install pcre-devel zlib zlib-devel openssl openssl-devel Upload and decompress the compressed package tar zxvf nginx-1.12.2.tar.gz Create a directory and test the configuration mkdir -p /usr/local/nginx ./configure --prefix=/usr/local/nginx Precompile and install make && make install Start and stop related commands cd /usr/local/nginx/sbin/ ./nginx ./nginx -s stop ./nginx -s start 1.2 Install keepalived yum install -y keepalived 2. Host configuration Modify the keepalived configuration file vim /etc/keepalived/keepalived.conf The modified contents are as follows # Newly added configuration vrrp_script chk_http_port {
script "/shell/nginx_check.sh" #script address interval 2 #check script execution interval weight 2 #weight}
vrrp_instance VI_1 {
state MASTER #The master server is MASTER, the slave server is BACKUP
interface eth0 #Network card virtual_router_id 51 #The virtual_router_id of the master and backup machines must be the same priority 100 #Different priorities for the master and backup machines. The master has a higher priority and the backup has a lower priority. The default is 100
advert_int 1
authentication
auth_type PASS
auth_pass 1111
}
#Virtual IP address virtual_ipaddress {
192.168.126.88
}
} Create a script file mkdir /shell/nginx_check.sh vim /shell/nginx_check.sh The script file contents are as follows #!/bin/bash
A=`ps -C nginx –no-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 3. Slave configuration Modify the keepalived configuration file vrrp_instance VI_1 {
state BACKUP #The master server is MASTER, the slave server is BACKUP
interface eth0 #Network card virtual_router_id 51 #The virtual_router_id of the master and backup machines must be the same priority 50 #Different priorities for the master and backup machines, the master has a higher priority and the backup has a lower value advert_int 1
authentication
auth_type PASS
auth_pass 1111
}
#Virtual IP address virtual_ipaddress {
192.168.126.88
}
} 4. Start the service start up service keepalived start View the virtual IP address ip addr
1: lo: <LOOPBACK,UP,LOWER_UP> mtu 65536 qdisc noqueue state UNKNOWN
link/loopback 00:00:00:00:00:00 brd 00:00:00:00:00:00
inet 127.0.0.1/8 scope host lo
inet6 ::1/128 scope host
valid_lft forever preferred_lft forever
2: eth0: <BROADCAST,MULTICAST,UP,LOWER_UP> mtu 1500 qdisc pfifo_fast state UP qlen 1000
link/ether 00:0c:29:4f:31:ce brd ff:ff:ff:ff:ff:ff
inet 192.168.126.100/24 brd 192.168.126.255 scope global eth0
inet 192.168.126.88/32 scope global eth0
inet6 fe80::20c:29ff:fe4f:31ce/64 scope link
valid_lft forever preferred_lft forever 5. Turn off the firewall test Turn off firewall service iptables stop # Check whether the firewall starts automatically at boot time chkconfig --list | grep iptables chkconfig iptables off Log in to the virtual IP address to view http://192.168.126.88/ Summarize The above is the full content of this article. I hope that the content of this article will have certain reference learning value for your study or work. Thank you for your support of 123WORDPRESS.COM. You may also be interested in:
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