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2020-03-19T19:27:00+02:00 Installation with Docker install-with-docker 10 false false
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installation With Docker 10 install-with-docker

Installation with Docker

Gitea provides automatically updated Docker images within its Docker Hub organization. It is possible to always use the latest stable tag or to use another service that handles updating Docker images.

This reference setup guides users through the setup based on docker-compose, but the installation of docker-compose is out of scope of this documentation. To install docker-compose itself, follow the official install instructions.

Table of Contents

{{< toc >}}

Basics

The most simple setup just creates a volume and a network and starts the gitea/gitea:latest image as a service. Since there is no database available, one can be initialized using SQLite3. Create a directory like gitea and paste the following content into a file named docker-compose.yml. Note that the volume should be owned by the user/group with the UID/GID specified in the config file. If you don't give the volume correct permissions, the container may not start. For a stable release you can use :latest, :1 or specify a certain release like :{{< version >}}, but if you'd like to use the latest development version of Gitea then you could use the :dev tag.

version: "3"

networks:
  gitea:
    external: false

services:
  server:
    image: gitea/gitea:{{< version >}}
    container_name: gitea
    environment:
      - USER_UID=1000
      - USER_GID=1000
    restart: always
    networks:
      - gitea
    volumes:
      - ./gitea:/data
      - /etc/timezone:/etc/timezone:ro
      - /etc/localtime:/etc/localtime:ro
    ports:
      - "3000:3000"
      - "222:22"

Ports

To bind the integrated openSSH daemon and the webserver on a different port, adjust the port section. It's common to just change the host port and keep the ports within the container like they are.

version: "3"

networks:
  gitea:
    external: false

services:
  server:
    image: gitea/gitea:{{< version >}}
    container_name: gitea
    environment:
      - USER_UID=1000
      - USER_GID=1000
    restart: always
    networks:
      - gitea
    volumes:
      - ./gitea:/data
      - /etc/timezone:/etc/timezone:ro
      - /etc/localtime:/etc/localtime:ro
    ports:
-     - "3000:3000"
-     - "222:22"
+     - "8080:3000"
+     - "2221:22"

Databases

MySQL database

To start Gitea in combination with a MySQL database, apply these changes to the docker-compose.yml file created above.

version: "3"

networks:
  gitea:
    external: false

services:
  server:
    image: gitea/gitea:{{< version >}}
    container_name: gitea
    environment:
      - USER_UID=1000
      - USER_GID=1000
+     - GITEA__database__DB_TYPE=mysql
+     - GITEA__database__HOST=db:3306
+     - GITEA__database__NAME=gitea
+     - GITEA__database__USER=gitea
+     - GITEA__database__PASSWD=gitea
    restart: always
    networks:
      - gitea
    volumes:
      - ./gitea:/data
      - /etc/timezone:/etc/timezone:ro
      - /etc/localtime:/etc/localtime:ro
     ports:
       - "3000:3000"
       - "222:22"
+    depends_on:
+      - db
+
+  db:
+    image: mysql:8
+    restart: always
+    environment:
+      - MYSQL_ROOT_PASSWORD=gitea
+      - MYSQL_USER=gitea
+      - MYSQL_PASSWORD=gitea
+      - MYSQL_DATABASE=gitea
+    networks:
+      - gitea
+    volumes:
+      - ./mysql:/var/lib/mysql

PostgreSQL database

To start Gitea in combination with a PostgreSQL database, apply these changes to the docker-compose.yml file created above.

version: "3"

networks:
  gitea:
    external: false

services:
  server:
    image: gitea/gitea:{{< version >}}
    container_name: gitea
    environment:
      - USER_UID=1000
      - USER_GID=1000
+     - GITEA__database__DB_TYPE=postgres
+     - GITEA__database__HOST=db:5432
+     - GITEA__database__NAME=gitea
+     - GITEA__database__USER=gitea
+     - GITEA__database__PASSWD=gitea
    restart: always
    networks:
      - gitea
    volumes:
      - ./gitea:/data
      - /etc/timezone:/etc/timezone:ro
      - /etc/localtime:/etc/localtime:ro
    ports:
      - "3000:3000"
      - "222:22"
+    depends_on:
+      - db
+
+  db:
+    image: postgres:13
+    restart: always
+    environment:
+      - POSTGRES_USER=gitea
+      - POSTGRES_PASSWORD=gitea
+      - POSTGRES_DB=gitea
+    networks:
+      - gitea
+    volumes:
+      - ./postgres:/var/lib/postgresql/data

Named volumes

To use named volumes instead of host volumes, define and use the named volume within the docker-compose.yml configuration. This change will automatically create the required volume. You don't need to worry about permissions with named volumes; Docker will deal with that automatically.

version: "3"

networks:
  gitea:
    external: false

+volumes:
+  gitea:
+    driver: local
+
services:
  server:
    image: gitea/gitea:{{< version >}}
    container_name: gitea
    restart: always
    networks:
      - gitea
    volumes:
-     - ./gitea:/data
+     - gitea:/data
      - /etc/timezone:/etc/timezone:ro
      - /etc/localtime:/etc/localtime:ro
    ports:
      - "3000:3000"
      - "222:22"

MySQL or PostgreSQL containers will need to be created separately.

Startup

To start this setup based on docker-compose, execute docker-compose up -d, to launch Gitea in the background. Using docker-compose ps will show if Gitea started properly. Logs can be viewed with docker-compose logs.

To shut down the setup, execute docker-compose down. This will stop and kill the containers. The volumes will still exist.

Notice: if using a non-3000 port on http, change app.ini to match LOCAL_ROOT_URL = http://localhost:3000/.

Installation

After starting the Docker setup via docker-compose, Gitea should be available using a favorite browser to finalize the installation. Visit http://server-ip:3000 and follow the installation wizard. If the database was started with the docker-compose setup as documented above, please note that db must be used as the database hostname.

Configure the user inside Gitea using environment variables

  • USER: git: The username of the user that runs Gitea within the container.
  • USER_UID: 1000: The UID (Unix user ID) of the user that runs Gitea within the container. Match this to the UID of the owner of the /data volume if using host volumes (this is not necessary with named volumes).
  • USER_GID: 1000: The GID (Unix group ID) of the user that runs Gitea within the container. Match this to the GID of the owner of the /data volume if using host volumes (this is not necessary with named volumes).

Customization

Customization files described here should be placed in /data/gitea directory. If using host volumes, it's quite easy to access these files; for named volumes, this is done through another container or by direct access at /var/lib/docker/volumes/gitea_gitea/_data. The configuration file will be saved at /data/gitea/conf/app.ini after the installation.

Upgrading

❗❗ Make sure you have volumed data to somewhere outside Docker container ❗❗

To upgrade your installation to the latest release:

# Edit `docker-compose.yml` to update the version, if you have one specified
# Pull new images
docker-compose pull
# Start a new container, automatically removes old one
docker-compose up -d

Managing Deployments With Environment Variables

In addition to the environment variables above, any settings in app.ini can be set or overridden with an environment variable of the form: GITEA__SECTION_NAME__KEY_NAME. These settings are applied each time the docker container starts. Full information here.

These environment variables can be passed to the docker container in docker-compose.yml. The following example will enable an smtp mail server if the required env variables GITEA__mailer__FROM, GITEA__mailer__HOST, GITEA__mailer__PASSWD are set on the host or in a .env file in the same directory as docker-compose.yml:

...
services:
  server:
    environment:
    - GITEA__mailer__ENABLED=true
    - GITEA__mailer__FROM=${GITEA__mailer__FROM:?GITEA__mailer__FROM not set}
    - GITEA__mailer__MAILER_TYPE=smtp
    - GITEA__mailer__HOST=${GITEA__mailer__HOST:?GITEA__mailer__HOST not set}
    - GITEA__mailer__IS_TLS_ENABLED=true
    - GITEA__mailer__USER=${GITEA__mailer__USER:-apikey}
    - GITEA__mailer__PASSWD="""${GITEA__mailer__PASSWD:?GITEA__mailer__PASSWD not set}"""

To set required TOKEN and SECRET values, consider using gitea's built-in generate utility functions.

SSH Container Passthrough

Since SSH is running inside the container, SSH needs to be passed through from the host to the container if SSH support is desired. One option would be to run the container SSH on a non-standard port (or moving the host port to a non-standard port). Another option which might be more straightforward is to forward SSH connections from the host to the container. This setup is explained in the following.

This guide assumes that you have created a user on the host called git which shares the same UID/ GID as the container values USER_UID/ USER_GID. These values can be set as environment variables in the docker-compose.yml:

environment:
  - USER_UID=1000
  - USER_GID=1000

Next mount /home/git/.ssh of the host into the container. Otherwise the SSH authentication cannot work inside the container.

volumes:
  - /home/git/.ssh/:/data/git/.ssh

Now a SSH key pair needs to be created on the host. This key pair will be used to authenticate the git user on the host to the container.

sudo -u git ssh-keygen -t rsa -b 4096 -C "Gitea Host Key"

In the next step a file named /app/gitea/gitea (with executable permissions) needs to be created on the host. This file will issue the SSH forwarding from the host to the container. Add the following contents to /app/gitea/gitea:

#!/bin/sh
ssh -p 2222 -o StrictHostKeyChecking=no git@127.0.0.1 "SSH_ORIGINAL_COMMAND=\"$SSH_ORIGINAL_COMMAND\" $0 $@"

Here you should also make sure that you've set the permisson of /app/gitea/gitea correctly:

sudo chmod +x /app/gitea/gitea

To make the forwarding work, the SSH port of the container (22) needs to be mapped to the host port 2222 in docker-compose.yml . Since this port does not need to be exposed to the outside world, it can be mapped to the localhost of the host machine:

ports:
  # [...]
  - "127.0.0.1:2222:22"

In addition, /home/git/.ssh/authorized_keys on the host needs to be modified. It needs to act in the same way as authorized_keys within the Gitea container. Therefore add the public key of the key you created above ("Gitea Host Key") to ~/git/.ssh/authorized_keys. This can be done via echo "$(cat /home/git/.ssh/id_rsa.pub)" >> /home/git/.ssh/authorized_keys. Important: The pubkey from the git user needs to be added "as is" while all other pubkeys added via the Gitea web interface will be prefixed with command="/app [...].

The file should then look somewhat like

# SSH pubkey from git user
ssh-rsa <Gitea Host Key>

# other keys from users
command="/app/gitea/gitea --config=/data/gitea/conf/app.ini serv key-1",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty <user pubkey>

Here is a detailed explanation what is happening when a SSH request is made:

  1. A SSH request is made against the host (usually port 22) using the git user, e.g. git clone git@domain:user/repo.git.
  2. In /home/git/.ssh/authorized_keys , the command executes the /app/gitea/gitea script.
  3. /app/gitea/gitea forwards the SSH request to port 2222 which is mapped to the SSH port (22) of the container.
  4. Due to the existence of the public key of the git user in /home/git/.ssh/authorized_keys the authentication host → container succeeds and the SSH request get forwarded to Gitea running in the docker container.

If a new SSH key is added in the Gitea web interface, it will be appended to .ssh/authorized_keys in the same way as the already existing key.

Notes

SSH container passthrough will work only if

  • opensshd is used in the container
  • if AuthorizedKeysCommand is not used in combination with SSH_CREATE_AUTHORIZED_KEYS_FILE=false to disable authorized files key generation
  • LOCAL_ROOT_URL is not changed