Keepalived+lvs configuration details
Installation:
Tar-zxvf keepalived-1.2.2.tar.gz
Yum list all | grep "ipvsadm"
Yum-y install kernel-devel openssl-develpopt-devel ipvsadm libnl libnl-devel
Service iptables stop
Setenforce 0
. / configure-- prefix=/--with-kernel-dir=/usr/src/kernels/2.6.32-431.el6.x86_64 & & make&& make install
Add system services:
Chkconfig-after add keepalived is added, you can use service and chkconfig tools to manage keepalived services
Chkconfig keepalived on on levels are 2, 3, 4
Chkconfig-- list keepalived to see if levels 2, 3 and 4 are enabled
Global profile:
Global_defs {
Notification_email {
Acassen@firewall.loc
Failover@firewall.loc
Sysadmin@firewall.loc
}
Notification_email_from Alexandre.Cassen@firewall.loc
Smtp_server 192.168.1.1
Smtp_connect_timeout 30
Router_id LVS_master
}
Vrrp_script check_httpd {
# vrrp_script module is specially used to monitor the service resources in the cluster (HA cluster monitoring). This module is also used with the track_script module, and the track_script module is mainly used to call the vrrp_script module. You can also check ports, shell statements, and scripts. Demonstrate below the appendix
Script "killall-O httpd"
# use killall-O httpd to check the returned status of httpd service. Zero indicates normal operation, while 1 indicates abnormal operation.
Interval 2
# the interval between checks (in seconds).
}
Example of Vrrp configuration (keepalived High availability configuration):
Vrrp_instance VI_1 {
# identity, the identity of the start of the vrrp instance
State MASTER
# define master and slave roles master and backup
Interface eth0
# specify listening Nic
Virtual_router_id51
# Virtual routing identity, which cannot be the same as master / slave.
Priority 100
# priority. The higher the number, the higher the priority. Under the same vrrp-instance, master must have higher priority than backup.
Advert_int 1
# set the time interval for synchronization checks between master and backup (in seconds)
Authentication {
Auth_type PASS
Auth_pass 1111
# set master and backup authentication types (AH, PASS) and password so that the master / slave passwords are the same before you can communicate.
}
Notify_master "/ etc/keep/master.sh"
Notify_backup "/ etc/keep/backup.sh"
Notify_fault "/ etc/keep/fault.sh"
# specifies that the script is executed when keepalived enters the state of master, backup, and fault. Examples of the script are shown in the appendix.
Track_script {
Check_httpd
}
# call the vrrp_script module. Check_httpd is the name followed by the vrrp_script module.
Virtual_ipaddress {
192.168.1.250
# Virtual address, you can set multiple addresses. It adds the address in the form of ip address add.
}
# nopreempt
# No preemption feature, this feature can only be used on nodes whose state status is backup, and this node has higher priority than other nodes
# preempt_delay 300
# preemption delay time in seconds. For example, if there is a jitter in the network, the master node sends the detection packet to the backup node in a timely manner. There is no problem with the actual master node, and there is no need for active / standby switching. The same is true of restarting the service or restarting the system.
}
-vrrp configuration Appendix-
-- vrrp configuration appendix
An example of the notify_master "/ etc/keep/master.sh" script is as follows:
#! / bin/bash
Logfile=/var/log/keep/keep-http-statsu.log
Echo "[MASTER]" > > $logfile
Date > > $logfile
Backup.sh and fault.sh skip.
Port check:
Vrrp_script check_httpd {
Script "
