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(Backup: update for postgresql 11)
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Backup server is provided by Manu (KVM virtual machine with 100 GB storage and 1 GB ram). Running on debian gnu/linux 10 buster.  
 
Backup server is provided by Manu (KVM virtual machine with 100 GB storage and 1 GB ram). Running on debian gnu/linux 10 buster.  
  
Documentation: https://linuxhint.com/setup_postgresql_replication/
+
Documentation: https://linuxhint.com/setup_postgresql_replication/ and https://www.percona.com/blog/2018/09/07/setting-up-streaming-replication-postgresql/
  
 
===Slave configuration: Step 1===
 
===Slave configuration: Step 1===
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  # systemctl restart postgresql
 
  # systemctl restart postgresql
 
Start the backup process,
 
 
psql -c "select pg_start_backup('initial_backup');"
 
rsync -cva -e 'ssh -p 12022' --inplace --exclude=*pg_xlog* /var/lib/postgresql/11/main/ 62.210.83.200:/var/lib/postgresql/11/main/
 
psql -c "select pg_stop_backup();"
 
  
 
Open 5432 port in the firewall
 
Open 5432 port in the firewall
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===Slave Configuration: Step 2===
 
===Slave Configuration: Step 2===
Create a recovery file called  recovery.conf and add following lines.
+
 
  standby_mode = 'on'
+
Copy data from master and create recovery.conf
primary_conninfo = 'host=213.167.243.152 port=5432 user=rep password=yourpassword'
+
  $ pg_basebackup -h git.fosscommunity.in -D /var/lib/postgresql/11/main/ -P -U rep --wal-method=fetch -R
  trigger_file = '/tmp/postgresql.trigger.5432'
 
  
 
Start the slave server
 
Start the slave server

Revision as of 22:44, 6 March 2020

Our public GitLab instance is https://git.fosscommunity.in

Hosting

Sponsored by GitLab Inc. Hosted at gandi.net in France.

Setup

Running on debian gnu/linux 10 buster with postgresql 11. Using gitlab package from http://fasttrack.debian.net

Check https://wiki.debian.org/gitlab for installation/update instructions.

Debian package specific documentation -> https://salsa.debian.org/ruby-team/gitlab/raw/buster-fasttrack/debian/README.Debian

Letsencrypt domains:

 letsencrypt --expand --webroot --webroot-path /usr/share/gitlab/public -d git.fosscommunity.in -d gitlabce.tk -d gitlab.debian.net -d wiki.fsci.org.in -d git.fsci.org.in  certonly

Mail Server Setup

Maintenance

Maintenance discussion at this loomio subgroup and this matrix chat room

Gitlab QA - running tests

<Create a user account for QA>

$ sudo gem install gitlab-qa

$ GITLAB_USERNAME=<username> GITLAB_PASSWORD=<password> gitlab-qa Test::Instance::Any gitlab/gitlab-ce-qa:<gitlab version> https://git.hacksk.xyz

Backup

Backup server is provided by Manu (KVM virtual machine with 100 GB storage and 1 GB ram). Running on debian gnu/linux 10 buster.

Documentation: https://linuxhint.com/setup_postgresql_replication/ and https://www.percona.com/blog/2018/09/07/setting-up-streaming-replication-postgresql/

Slave configuration: Step 1

Install postgresql and rsync

# apt-get install postgresql-contrib-11 rsync

Check postgresql server is running

# su postgres -c psql

Make sure en_US.UTF-8 locale is available

# dpkg-reconfigure locales

Create ssh key for postgres user

# su - postgres
$ ssh-keygen -t ed25519

Now copy /var/lib/postgresql/.ssh/id_ed25519.pub to master postgres users' /var/lib/postgresql/.ssh/authorized_keys

Stop postgresql before changing any configuration

# systemctl stop postgresql@11-main

as postgres user

$ su - postgres
$ cd /etc/postgresql/11/main

Open the postgres configuration file

$ nano postgresql.conf

Set the following configuration options in the postgresql.conf file

listen_addresses = 'localhost,192.168.0.115'
port=5432
wal_level = replica
max_wal_senders = 1
archive_mode = on
archive_command = 'cd .'
hot_standby = on

Master configuration

Create and copy ssh public key to slave like above.

# su - postgres
$ ssh-keygen

Now copy /var/lib/postgresql/.ssh/id_rsa.pub to slave postgres users' /var/lib/postgresql/.ssh/authorized_keys

Create postgresql user for replication.

$ psql -c "CREATE USER rep REPLICATION LOGIN CONNECTION LIMIT 1 ENCRYPTED PASSWORD 'yourpassword';"

Allow slave to connect to master using the user just created.

$ cd /etc/postgresql/11/main
$ nano pg_hba.conf

Add below line to allow rep user to get access to the server

host    replication     rep     62.210.83.200/32   md5

Next , open the postgres configuration file

nano postgresql.conf

Set the following configuration options in the postgresql.conf file

listen_addresses = 'localhost,213.167.243.152'
port=5432
wal_level = replica
max_wal_senders = 1
archive_mode = on
archive_command = 'cd .'
hot_standby = on

Now, to activate your changes, reload the postgresql server

# systemctl reload postgresql@11-main

You may need to restart it via systemd,

# systemctl restart postgresql

Open 5432 port in the firewall

# ufw allow from 62.210.83.200 to any port 5432 proto tcp

Slave Configuration: Step 2

Copy data from master and create recovery.conf

$ pg_basebackup -h git.fosscommunity.in -D /var/lib/postgresql/11/main/ -P -U rep --wal-method=fetch  -R

Start the slave server

# systemctl start postgresql@11-main

Replication Status

On master server ,

$ ps -ef | grep sender

On slave server,

$ ps -ef | grep receiver