Haproxy configuration setting to redirect request from 1 server to another

[Shivam Arora]

Hi All,

I am trying to achieve a scenario in which if the Gerrit Master server is unavailable, then HA proxy should redirect the request which is coming to Master Server (which is down)should be directed to the replica (which is available at that time) as failover server.

Thanks,
Shivam

[Björn Pedersen]

Hi, 

Check https://gerrit.googlesource.com/plugins/high-availability/ and https://gerrit.googlesource.com/plugins/multi-site/+/HEAD/DESIGN.md (and references therein)

Björn

[Shivam Arora]

Hi ,

Thanks for the suggestion. What we are trying to achieve is that we already have HAproxy and Gerrit server setup in place. So, we want to make the changes in the HAproxy in such a way it should perform round-robin. If the Production Gerrit server goes down then we can redirect the traffic from HAproxy to the Slave server automatically. Please suggest how can we achieve that we have made the below changes:

global

    log 127.0.0.1 local2 debug

    #daemon

    pidfile /var/run/haproxy.pid

    maxconn 16000

    #group gerrit

defaults

    #mode tcp

    retries 3

    timeout connect 5000ms

    timeout client 500000ms

    timeout server 500000ms

frontend ssh-in

    log 127.0.0.1 local2 debug

    bind *:29418 transparent

    mode tcp

    default_backend gerrit-ssh-servers

    option tcplog

option redispatch

balance roundrobin

    log-format "%ci:%cp [%t] %ft %b/%s %Tw/%Tc/%Tt %B %ts %ac/%fc/%bc/%sc/%rc %sq/%bq %bi:%bp"

email-alert mailers mymailers

   

frontend https

    log 127.0.0.1 local2 debug

    bind *:443 transparent

    option tcplog

    log-format "%ci:%cp [%t] %ft %b/%s %Tw/%Tc/%Tt %B %ts %ac/%fc/%bc/%sc/%rc %sq/%bq %bi:%bp"

    #mode http

    option forwardfor except 127.0.0.1

balance roundrobin

    #maxconn 5000

    # NOTE: users should connect over ssh to

    # <ip>:<ssh_port>, which should be the same as the

    # sshd.advertisedAddress parameter in the

    # 'gerrit.config' files

    default_backend gerrit-https-servers

email-alert mailers mymailers

    

backend gerrit-ssh-servers

    log 127.0.0.1 local2 debug

    option redispatch

balance roundrobin

    server gerritM1 XX.XXX.XX.XXX:29418 check 60s

    server gerritM2 XX.XXX.XX.XXX:29418 check

email-alert mailers mymailers

  

    source 0.0.0.0 usesrc clientip

backend gerrit-https-servers

    log 127.0.0.1 local2 debug

    option redispatch

balance roundrobin

    server gerritM1 XX.XXX.XX.XXX:443 check 60s

    server gerritM2 9XX.XXX.XX.XXX:443 check

    source 0.0.0.0 usesrc clientip

    email-alert mailers mymailers

    

#    http-request cache-use mycache if { path_beg /gerrit/plugins/events-log/  }

#    http-response cache-store mycache

listen status

    bind 0.0.0.0:1080

    mode http

    log global

    stats refresh 30s

    stats uri /haproxy?stats

    stats realm Private lands

    stats auth admin:password

    stats hide-version