Call the script parameter meaning
vrrp_script <SCRIPT_NAME> {# define a detection script, disposed outside global_defs
Script <STRING> | <the QUOTED-STRING> # the shell command or script path
interval <INTEGER> # interval, in seconds, 1 second default
timeout <INTEGER > # timeout
weight <INTEGER: -254..254> # weights will monitor the implementation of the weights after the failure of the + operator
fall <INTEGER> # script failed to convert several failures
rise <INTEGER> # after the results of continuous detection script, the server the number of failures for a successful tag from
user USERNAME [GROUPNAME] # monitoring execution of the user or group
init_fail # set the default state marked as failed, and then converted to successfully monitor after successful status
}
Real one: to achieve high availability ping the gateway address detection
1, the host A configuration keepalived call ping script.
Writing a script, ping the IP address of the gateway host, if the ping fails, start the following keepalived configuration file contents.
vim /etc/keepalived/ping.sh
#!/bin/bash ping -c 192.168.37.2 &> /dev/null if [ $? -eq 0 ];then exit 0 else exit 2 fi
Plus execute permissions: chmod + x ping.sh
Keepalived configuration file, when more than ping script fails, the following configuration file is executed, then the weight will be minus 50, it will reduce the priority, then it will drift to the VIP address from the server.
vim /etc/keepalived/keepalived.conf
{global_defs
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
the router_id of the KA2
vrrp_skip_check_adv_addr
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script linux_ping named {scripts are invoked
script /etc/keepalived/ping.sh call script path
2 second interval time interval 2
weight -50 weight minus 50
Fall 3 into three consecutive failures failure
after successful detection of Rise 5 consecutive 5 times, successfully labeled
timeout 2 2 seconds timeout
}
vrrp_instance VIP_1 {
State the MASTER
interface ens33
50 virtual_router_id
priority 100
unicast_src_ip 192.168.37.7
unicast_peer {
192.168.37.17
}
advert_int 2
authentication {
AUTH_TYPE the PASS
AUTH_PASS 123456
}
virtual_ipaddress {
192.168.37.100 dev ens33 label ens33:. 1
}
track_script {
linux_ping examination script, the above named after call
}
}
2, the host configuration B keepalived
Writing a script, ping the IP address of the gateway host, if the ping fails, start the following keepalived configuration file contents.
vim /etc/keepalived/ping.sh
#!/bin/bash ping -c 192.168.37.2 &> /dev/null if [ $? -eq 0 ];then exit 0 else exit 2 fi
Plus execute permissions: chmod + x ping.sh
vim /etc/keepalived/keepalived.conf
{global_defs
notification_email {
the root @ localhost
}
notification_email_from the root @ localhost
smtp_server 127.0.0.1
smtp_connect_timeout 30
the router_id of the KA1
vrrp_skip_check_adv_addr
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script linux_ping {
Script /etc/keepalived/ping.sh ping scripts also call, when the barrier from the gateway server Ping when the weight reduction is also 50, the priority becomes low at this time, when the primary server, it will drift to the VIP address of the primary server.
2 interval The
weight -50
Fall. 3
Rise. 5
timeout 2
}
vrrp_instance VIP_1 {
State the BACKUP
interface ens33
virtual_router_id 50
priority 80
unicast_src_ip 192.168.37.17
unicast_peer {
192.168.37.7
}
advert_int 2
authentication {
auth_type PASS
auth_pass 123456
}
virtual_ipaddress {
192.168.37.100 dev ens33 label ens33:1
}
track_script {
linux_ping
}
}
3, test results:
The gateway address ping.sh script changes the IP address does not exist.
vim /etc/keepalived/ping.sh
#!/bin/bash #ping -c 192.168.37.2 &> /dev/null ping -c 192.168.77.2 &> /dev/null if [ $? -eq 0 ];then exit 0 else exit 2 fi
Restart the master-slave keepalived service: systemctl reload keepalived
At this point you can see has drifted to the VIP address from the server.
When the IP address of the primary gateway server correctly modified, VIP address it will float back to the primary server.
Combat II: HAProxy achieve high availability detection
1, the configuration in keepalived A host and write a script to detect haproxy
vim /etc/keepalived/chk_haproxy.sh
#!/bin/bash # #******************************************************************** #Author: liu #QQ: 29308620 #Date: 2019-12-26 #FileName： /etc/keepalived/chk_haproxy.sh #URL: http://www.struggle.com #Description： The test script #Copyright (C): 2019 All rights reserved #******************************************************************** killall -0 haproxy
Keepalived modify the configuration file, call detection haproxy script.
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id ka2
vrrp_skip_check_adv_addr
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script chk_haproxy {
script /etc/keepalived/chk_haproxy.sh 调用chk_haproxy.sh脚本
interval 2
weight -50
fall 3
rise 5
timeout 2
}
vrrp_instance VIP_1 {
state MASTER
interface ens33
virtual_router_id 50
100 priority
unicast_src_ip 192.168.37.7
unicast_peer {
192.168.37.17
}
advert_int 2
authentication {
AUTH_TYPE the PASS
AUTH_PASS 123456
}
virtual_ipaddress {
192.168.37.100 dev ens33 label ens33:. 1
}
track_script {
chk_haproxy above calling script call name
}
}
A host configuration file haproxy
global
maxconn 100000
chroot /usr/local/haproxy
stats socket /var/lib/haproxy/haproxy.sock1 mode 600 level admin process 1
stats socket /var/lib/haproxy/haproxy.sock2 mode 600 level admin process 2
user haproxy
group haproxy
daemon
nbproc 2
cpu-map 1 0
cpu-map 2 1
#cpu-map 3 2
#cpu-map 4 3
pidfile /run/haproxy.pid
log 127.0.0.1 local3 info
defaults
option http-keep-alive
option forwardfor
maxconn 100000
mode http
timeout connect 300000ms
timeout client 300000ms
timeout server 300000ms
listen stats
bind :9527
stats enable
stats hide-version
stats uri /haproxy-status
stats realm HAPorxy\Stats\Page
stats auth haadmin:123456
stats auth admin:123456
stats refresh 30s
stats admin if TRUE
listen web_port
bind 0.0.0.0:80
mode http
log global
server web1 127.0.0.1:80 check inter 3000 fall 2 rise 5
2, B-host configuration keepalived, and write a script to detect haproxy
vim /etc/keepalived/chk_haproxy.sh
#! / bin / bash # # ****************************************** ************************** #Author: liu # QQ: 29.30862 million #Date: 2019-12-26 #filename: / etc / keepalived / chk_haproxy.sh #URL: http://www.struggle.com #description: the Test Script at The #Copyright (C): 2019 All Rights Reserved # ****************** ************************************************** killall -0 haproxy signal to haproxy, determining status information on the haproxy.
Keepalived modify the configuration file, call detection haproxy script.
global_defs {
notification_email {
[email protected]
}
notification_email_from [email protected]
smtp_server 127.0.0.1
smtp_connect_timeout 30
router_id ka2
vrrp_skip_check_adv_addr
vrrp_iptables
vrrp_garp_interval 0
vrrp_gna_interval 0
}
vrrp_script chk_haproxy {
script /etc/keepalived/chk_haproxy.sh 调用chk_haproxy.sh脚本
interval 2
weight -50
fall 3
rise 5
timeout 2
}
vrrp_instance VIP_1 {
state BACKUP
interface ens33
virtual_router_id 50
100 priority
unicast_src_ip 192.168.37.17
unicast_peer {
192.168.37.7
}
advert_int 2
authentication {
AUTH_TYPE the PASS
AUTH_PASS 123456
}
virtual_ipaddress {
192.168.37.100 dev ens33 label ens33:. 1
}
track_script {
chk_haproxy above calling script call name
}
}
B host configuration file haproxy
global
maxconn 100000
chroot /usr/local/haproxy
stats socket /var/lib/haproxy/haproxy.sock1 mode 600 level admin process 1
stats socket /var/lib/haproxy/haproxy.sock2 mode 600 level admin process 2
user haproxy
group haproxy
daemon
nbproc 2
cpu-map 1 0
cpu-map 2 1
#cpu-map 3 2
#cpu-map 4 3
pidfile /run/haproxy.pid
log 127.0.0.1 local3 info
defaults
option http-keep-alive
option forwardfor
maxconn 100000
mode http
timeout connect 300000ms
timeout client 300000ms
timeout server 300000ms
listen stats
bind :9527
stats enable
stats hide-version
stats uri /haproxy-status
stats realm HAPorxy\Stats\Page
stats auth haadmin:123456
stats auth admin:123456
stats refresh 30s
stats admin if TRUE
listen web_port
bind 0.0.0.0:80
mode http
log global
server web1 127.0.0.1:80 check inter 3000 fall 2 rise 5
3, test results:
A server will host haproxy stopped, then it will drift to the VIP address from the server.
When starting haproxy server, VIP address it will drift back to the primary server
If you want to achieve high availability nginx testing, only need to read the script : killall -0 nginx;
This script can then call keepalived profile.