GitLab

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 gitlab.debian.net -d wiki.fsci.org.in -d git.fsci.org.in  certonly

Mail Server Setup

postfix is used
SPF record is added (only a and aaaa allowed to send mails)
Reverse DNS is updated in gandi.net server ip section
Using letsencrypt certificates for tls in main.cf
Using 'inet_interfaces = 127.0.0.1' in main.cf
Configured DKIM following https://www.linode.com/docs/email/postfix/configure-spf-and-dkim-in-postfix-on-debian-8/
DMARC is set to reject

Maintenance

Maintenance discussion at this loomio subgroup and this matrix chat room

team repo with access details (private)

Gitlab QA - running tests

$ 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
$ psql -c "select * from pg_stat_activity where usename='rep';"

On slave server,

$ ps -ef | grep receiver

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