Gerrit master + slave Docker playground

Example of set-up of a Gerrit master-slave replication scenario.

This docker compose configuration creates the following scenario:

• Gerrit DB on PostgreSQL shared between master and slaves
• Gerrit master listening to port 18080 (Web and Git/HTTP) and 29418 (Git/SSH) with "development_become_any_account" authentication
• First Gerrit slave listening to port 18081 (Git/HTTP)
• Second Gerrit slave listening to port 18082 (Git/HTTP)
• Gerrit user 'admin' with password 'secret'

Pre-requisites

• Docker 1.12.x
• Docker compose 1.8 or later
• Linux or MacOS operating systems
• GNU make (standard on Linux and MacOS)

How to start

Just type 'make' to trigger the Docker images download and startup.

Example:

$ make
[...]
Successfully built d7ed58376801
docker-compose up -d
Creating gerritmasterslavedocker_postgres_1
Creating gerritmasterslavedocker_gerrit-master_1
Creating gerritmasterslavedocker_gerrit-slave-httpd_1
Creating gerritmasterslavedocker_gerrit-slave-nginx_1

Display the VMs

To display list of docker VMs active type 'make status'

Example:

$ make status
CONTAINER ID        IMAGE                COMMAND                  CREATED             STATUS              PORTS                                               NAMES
9dd54f6ded91        gerrit-slave-nginx   "/bin/sh -c /bin/star"   11 seconds ago      Up 9 seconds        29418/tcp, 0.0.0.0:18081->8080/tcp                  gerritmasterslavedocker_gerrit-slave-nginx_1
d5d1b91706e3        gerrit-slave-httpd   "/bin/sh -c /bin/star"   11 seconds ago      Up 9 seconds        29418/tcp, 0.0.0.0:18082->8080/tcp                  gerritmasterslavedocker_gerrit-slave-httpd_1
3c04ba9a7e87        gerrit-master        "/bin/sh -c /bin/star"   12 seconds ago      Up 10 seconds       0.0.0.0:29418->29418/tcp, 0.0.0.0:18080->8080/tcp   gerritmasterslavedocker_gerrit-master_1
6d4adba0cac2        postgres:9.5.4       "/docker-entrypoint.s"   13 seconds ago      Up 11 seconds       5432/tcp                                            gerritmasterslavedocker_postgres_1

Display the logs

Each of the VM has associated a SHA1. If you want to display the logs of one of them, type the command 'docker logs '.

Example:

$ docker logs 3c04ba9a7e87
+ chown -R gerrit: /var/gerrit/.ssh
+ chmod 600 /var/gerrit/.ssh/id_rsa
+ wait-for-it.sh gerrit-slave-nginx:22 -- echo 'Slave is up'
wait-for-it.sh: waiting 15 seconds for gerrit-slave-nginx:22
wait-for-it.sh: gerrit-slave-nginx:22 is available after 2 seconds
Slave is up
+ sudo -u gerrit ssh -oStrictHostKeyChecking=no gerrit-slave-nginx exit
Warning: Permanently added 'gerrit-slave-nginx,172.18.0.5' (ECDSA) to the list of known hosts.
+ wait-for-it.sh gerrit-slave-httpd:22 -- echo 'Slave is up'
wait-for-it.sh: waiting 15 seconds for gerrit-slave-httpd:22
wait-for-it.sh: gerrit-slave-httpd:22 is available after 0 seconds
Slave is up
+ sudo -u gerrit ssh -oStrictHostKeyChecking=no gerrit-slave-httpd exit
Warning: Permanently added 'gerrit-slave-httpd,172.18.0.4' (ECDSA) to the list of known hosts.
+ wait-for-it.sh postgres:5432 -- echo 'Postgres is up'
wait-for-it.sh: waiting 15 seconds for postgres:5432
wait-for-it.sh: postgres:5432 is available after 3 seconds
Postgres is up
+ sudo -u gerrit rm -Rf /var/gerrit/git/All-Projects.git /var/gerrit/git/All-Users.git
+ sudo -u gerrit java -jar /var/gerrit/bin/gerrit.war init -d /var/gerrit --batch --install-plugin replication
Initialized /var/gerrit
+ /etc/init.d/gerrit start
sh: echo: I/O error
Starting Gerrit Code Review: OK
+ tail -f /var/gerrit/logs/error_log
[2016-10-03 07:30:38,181] [main] INFO  com.google.gerrit.server.git.LocalDiskRepositoryManager : Defaulting core.streamFileThreshold to 148m
[2016-10-03 07:30:38,852] [main] INFO  com.google.gerrit.server.plugins.PluginLoader : Loading plugins from /var/gerrit/plugins
[2016-10-03 07:30:39,165] [main] INFO  com.google.gerrit.server.plugins.PluginLoader : Loaded plugin replication, version v2.13.1
[2016-10-03 07:30:39,167] [main] INFO  com.google.gerrit.server.change.ChangeCleanupRunner : Ignoring missing changeCleanup schedule configuration
[2016-10-03 07:30:39,240] [main] INFO  com.google.gerrit.sshd.SshDaemon : Started Gerrit SSHD-CORE-1.2.0 on *:29418
[2016-10-03 07:30:39,248] [main] INFO  org.eclipse.jetty.server.Server : jetty-9.2.14.v20151106
[2016-10-03 07:30:39,927] [main] INFO  org.eclipse.jetty.server.handler.ContextHandler : Started o.e.j.s.ServletContextHandler@7238c3bf{/,null,AVAILABLE}
[2016-10-03 07:30:39,938] [main] INFO  org.eclipse.jetty.server.ServerConnector : Started ServerConnector@69444b07{HTTP/1.1}{0.0.0.0:8080}
[2016-10-03 07:30:39,940] [main] INFO  org.eclipse.jetty.server.Server : Started @15480ms
[2016-10-03 07:30:39,942] [main] INFO  com.google.gerrit.pgm.Daemon : Gerrit Code Review 2.13.1 ready

Access Gerrit master and slaves

Assuming you are running Docker on your localhost, open the Gerrit master Web GUI at: http://localhost:18080

On the top-right choose "Become" and select "Administrator" to login as admin user. You can then create a new repository, called test-project, from the "Projects" and then "Create New Project" menu. Enter the "test-project" in the Project Name, select "Create initial empty commit" field and press the "Create Project" button.

Cloning the project from one of the slaves

To clone the projects from one of the slaves, use one of the following URLs:

• http://localhost:18081/test-project
• http://localhost:18082/test-project

Pushing to Gerrit master

To push new changes to Gerrit master, use the following URL:

• http://localhost:18080/test-project