01.07. Installation Haproxy and Keepalived on app-haproxy01

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####################
###    Haproxy
####################

1. Creating user haproxy

[root]# groupadd haproxy
[root]# useradd haproxy -g haproxy

2. Installation haproxy
[root]# yum -y install haproxy.x86_64

3. Configuration service
[root]# vi /etc/haproxy/haproxy.cfg
global
        maxconn 100
        log     127.0.0.1 local2
defaults
        log global
        mode tcp
        retries 2
        timeout client 30m
        timeout connect 4s
        timeout server 30m
        timeout check 5s
listen stats
    mode http
    bind *:8080
    stats enable
    stats uri /
listen postgres
    bind *:5000
    option httpchk
    http-check expect status 200
    default-server inter 3s fall 3 rise 2 on-marked-down shutdown-sessions
    server pgsql-db01 192.168.1.81:5432 maxconn 100 check port 8008
    server pgsql-db02 192.168.1.82:5432 maxconn 100 check port 8008

4. Startup Haproxy
[root]# systemctl enable haproxy
[root]# systemctl start haproxy
[root]# systemctl status haproxy

5. Checking WEB
http://192.168.1.83:8080/

####################
###    Keepalived
####################

1. Installation Keeplived
[root]# yum -y install keepalived.x86_64

2. Configuration
[root]# vi /etc/keepalived/keepalived.conf
##########################################################
vrrp_script chk_haproxy {
script "killall -0 haproxy"   # verify the pid existance
interval 2                    # check every 2 seconds
weight 2                      # add 2 points of prio if OK
}
vrrp_instance VI_1 {
interface ens192              # interface to monitor
state MASTER
virtual_router_id 51          # Assign one ID for this route
priority 100                  # 100 on master, 50 on backup
virtual_ipaddress {
192.168.1.88            # the virtual IP
}
track_script {
chk_haproxy
  }
}

3. Startup Haproxy
[root]# systemctl enable keepalived
[root]# systemctl start keepalived
[root]# systemctl status keepalived

4. Availability check

[root]# ip a

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