Environment: centos7.6 minimize installation
Main: 10.11.1.32
From: 10.11.1.33
VIP:10.11.1.130
Modify the primary host name:
hostnamectl set-hostname web_balance_01
Modify the host name from the node:
hostnamectl set-hostname web_balance_02
A mounting Nginx (two nodes need to be installed)
Configuring the official nginx source
paint /etc/yum.repos.d/nginx.repo [nginx] name = nginx repo baseurl = http: //nginx.org/packages/centos/7/$basearch/ gpgcheck = 0 enabled = 1
yum install nginx way
yum install nginx
Second, the installation keepalived (two nodes need to be installed)
Dependent on the installation environment
yum -y install libnl libnl-devel
Download keepalived pack and unpack
cd /tmp wget https://www.keepalived.org/software/keepalived-2.0.19.tar.gz tar -xf keepalived-2.0.19.tar.gz
Compile and install
./configure --prefix=/usr/local/keepalived make -j2 make install
Under the copy startup script to /etc/init.d/ directory
cd /tmp/keepalived-2.0.19 cp keepalived/etc/init.d/keepalived /etc/init.d/
cp keepalived/etc/sysconfig/keepalived /etc/sysconfig/ mkdir /etc/keepalived cp etc/keepalived/keepalived.conf /etc/keepalived/
Fourth, modify the master node configuration file keepalived.conf
cd /etc/keepalived/ cp -r keepalived.conf keepalived.conf_bak vi keepalived.conf
Keepalived.conf master node configured as follows:
! Keepalived the Configuration File for
global_defs {
the router_id of the web_balance_01 # identification name of the node, typically hostname
}
analyzed ## keepalived periodically script execution script execution result and dynamically adjusts the priority of vrrp_instance.
## If the script execution result is 0, and the value of greater than 0 weight configuration, the priority corresponding increase. If the script execution result is nonzero,
the value and the weight ## is disposed less than 0, the priority corresponding reduction. Other cases, the priority of maintaining the original configuration, i.e. the value corresponding to the priority in the configuration file.
{chk_nginx vrrp_script
Script "/etc/keepalived/nginx_check.sh"
interval The # 2 once every 2 seconds nginx detected operating state of
weight -20 # failed once, their priority -20
}
vrrp_instance VI_1 {
State # the MASTER state, the main node MASTER, the backup node to the bACKUP
interface enp175s0f0 # bindings VIP network interface, see your network interface ifconfig
virtual_router_id 51 # virtual route ID number, set up two nodes must be the same, use the optional IP last paragraph, the same VRID as a group, he will determine the multicast MAC address
mcast_src_ip 10.11.1.32 # Local IP address
priority 100 # node priority, value range 0 ~ 254, MASTER BACKUP higher than
advert_int 1 # multicast transmission time interval, the same two nodes must be set, the default is one second
nopreempt non-preemptive mode using #
# Set authentication information, two nodes must match
authentication {
AUTH_TYPE the PASS
AUTH_PASS 1111
}
# virtual IP, the same two nodes must be provided. Plurality may be provided, a write line
virtual_ipaddress {
10.11.1.130
}
track_script {
chk_nginx # Nginx viable state detection script
}
}
Keepalived.conf slave node configured as follows:
! Keepalived the Configuration File for
global_defs {
the router_id of the web_balance_02 # identification name of the node, typically hostname
}
## keepalived periodically script execution result is analyzed and executed by the script, to dynamically adjust the priority vrrp_instance.
## If the script execution result is 0, and the value of greater than 0 weight configuration, the priority corresponding increase. If the script execution result is nonzero,
the value and the weight ## is disposed less than 0, the priority corresponding reduction. Other cases, the priority of maintaining the original configuration, i.e. the value corresponding to the priority in the configuration file.
{chk_nginx vrrp_script
Script "/etc/keepalived/nginx_check.sh"
interval The # 2 once every 2 seconds nginx detected operating state of
weight -20 # failed once, their priority -20
}
vrrp_instance VI_1 {
State # the BACKUP status, primary node MASTER, the backup node to the bACKUP
interface enp175s0f0 # bindings VIP network interface, see your network interface ifconfig
virtual_router_id 51 # virtual route ID number, set up two nodes must be the same, use the optional IP last paragraph, the same VRID as a group, he will determine the multicast MAC address
mcast_src_ip 10.11.1.33 # Local IP address
priority 90 # node priority, value range 0 ~ 254, MASTER BACKUP higher than
advert_int 1 # multicast transmission time interval, the same two nodes must be set, the default is one second
nopreempt non-preemptive mode using #
# Set authentication information, two nodes must match
authentication {
AUTH_TYPE the PASS
AUTH_PASS 1111
}
# virtual IP, the same two nodes must be provided. Plurality may be provided, a write line
virtual_ipaddress {
10.11.1.130
}
track_script {
chk_nginx # Nginx viable state detection script
}
}
Fifth, create nginx presence status detection script (two nodes need to create)
CD / etc / keepalived
More nginx_check.sh
! # / bin / the bash
A = `PS -C nginx --no-header | WC -l`
IF [$ A -eq 0]; the then
systemctl # try to restart the restart nginx nginx
sleep 2 # sleep two seconds
IF [PS -C nginx `--no-header | WC -l` -eq 0]; the then
killall # keepalived failed to start the service keepalived killed. The drift to other backup nodes vip
Fi
Fi
Add the script execution permissions
chmod +x /etc/keepalived/nginx_check.sh
Sixth, in turn starts from the master node and nodes nginx and services keepalived
systemctl start nginx systemctl enable nginx systemctl start keepalived systemctl enable keepalived
Seven inquiries VIP binding on the primary node
Eight, to stop any node nginx service, check whether keepalived nginx service starts automatically via script
Nine, stop the master node keepalived services can be seen from the VIP has been bound to the node
