30 KiB
date | slug | sidebar_position | aliases | |
---|---|---|---|---|
2020-03-19T19:27:00+02:00 | install-with-docker | 70 |
|
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.
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 :@dockerVersion@
, but if you'd like to use the latest development version of Gitea then you could use the :nightly
tag. If you'd like to run the latest commit from a release branch you can use the :1.x-nightly
tag, where x is the minor version of Gitea. (e.g. :1.16-nightly
)
version: "3"
networks:
gitea:
external: false
services:
server:
image: gitea/gitea:@dockerVersion@
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:@dockerVersion@
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:@dockerVersion@
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:@dockerVersion@
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:14
+ 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:@dockerVersion@
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
:::note From July 2023 Compose V1 stopped receiving updates. It's also no longer available in new releases of Docker Desktop.
Compose V2 is included with all currently supported versions of Docker Desktop. Please use V2 to do below operations. :::
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.
:::note
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
:::warning 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, and won't be passed into Gitea's sub-processes.
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
.
The settings can be also set or overridden with the content of a file by defining an environment variable of the form:
GITEA__section_name__KEY_NAME__FILE
that points to a file.
...
services:
server:
environment:
- GITEA__mailer__ENABLED=true
- GITEA__mailer__FROM=${GITEA__mailer__FROM:?GITEA__mailer__FROM not set}
- GITEA__mailer__PROTOCOL=smtps
- GITEA__mailer__SMTP_ADDR=${GITEA__mailer__SMTP_ADDR:?GITEA__mailer__SMTP_ADDR not set}
- GITEA__mailer__SMTP_PORT=${GITEA__mailer__SMTP_PORT:?GITEA__mailer__SMTP_PORT not set}
- GITEA__mailer__USER=${GITEA__mailer__USER:-apikey}
- GITEA__mailer__PASSWD="""${GITEA__mailer__PASSWD:?GITEA__mailer__PASSWD not set}"""
Gitea will generate new secrets/tokens for every new installation automatically and write them into the app.ini. If you want to set the secrets/tokens manually, you can use the following docker commands to use of Gitea's built-in generate utility functions. Do not lose/change your SECRET_KEY after the installation, otherwise the encrypted data can not be decrypted anymore.
The following commands will output a new SECRET_KEY
and INTERNAL_TOKEN
to stdout
, which you can then place in your environment variables.
docker run -it --rm gitea/gitea:1 gitea generate secret SECRET_KEY
docker run -it --rm gitea/gitea:1 gitea generate secret INTERNAL_TOKEN
...
services:
server:
environment:
- GITEA__security__SECRET_KEY=[value returned by generate secret SECRET_KEY]
- GITEA__security__INTERNAL_TOKEN=[value returned by generate secret INTERNAL_TOKEN]
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 for Gitea users to ssh to a Gitea user on the host which will then relay those connections to the docker.
Understanding SSH access to Gitea (without passthrough)
To understand what needs to happen, you first need to understand what happens without passthrough. So we will try to explain this:
- The client adds their SSH public key to Gitea using the webpage.
- Gitea will add an entry for this key to the
.ssh/authorized_keys
file of its running user,git
. - This entry has the public key, but also has a
command=
option. It is this command that Gitea uses to match this key to the client user and manages authentication. - The client then makes an SSH request to the SSH server using the
git
user, e.g.git clone git@domain:user/repo.git
. - The client will attempt to authenticate with the server, passing one or more public keys one at a time to the server.
- For each key the client provides, the SSH server will first check its configuration for an
AuthorizedKeysCommand
to see if the public key matches, and then thegit
user'sauthorized_keys
file. - The first entry that matches will be selected, and assuming this is a Gitea entry, the
command=
will now be executed. - The SSH server creates a user session for the
git
user, and using the shell for thegit
user runs thecommand=
- This runs
gitea serv
which takes over control of the rest of the SSH session and manages gitea authentication & authorization of the git commands.
Now, for the SSH passthrough to work, we need the host SSH to match the public keys and then run the gitea serv
on the docker. There are multiple ways of doing this. However, all of these require some information about the docker being passed to the host.
SSHing Shim (with authorized_keys)
In this option, the idea is that the host simply uses the authorized_keys
that gitea creates but at step 9 the gitea
command that the host runs is a shim that actually runs ssh to go into the docker and then run the real docker gitea
itself.
-
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 thelocalhost
of the host machine:ports: # [...] - "127.0.0.1:2222:22"
-
Next on the host create the
git
user which shares the sameUID
/GID
as the container valuesUSER_UID
/USER_GID
. These values can be set as environment variables in thedocker-compose.yml
:environment: - USER_UID=1000 - USER_GID=1000
-
Mount
/home/git/.ssh
of the host into the container. This ensures that theauthorized_keys
file is shared between the hostgit
user and the containergit
user 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. As an administrative user on the host run: (by administrative user we mean a user that can sudo to root)sudo -u git ssh-keygen -t rsa -b 4096 -C "Gitea Host Key"
-
Please note depending on the local version of ssh you may want to consider using
-t ecdsa
here. -
/home/git/.ssh/authorized_keys
on the host now needs to be modified. It needs to act in the same way asauthorized_keys
within the Gitea container. Therefore add the public key of the key you created above ("Gitea Host Key") to~/git/.ssh/authorized_keys
. As an administrative user on the host run:sudo -u git cat /home/git/.ssh/id_rsa.pub | sudo -u git tee -a /home/git/.ssh/authorized_keys sudo -u git chmod 600 /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 withcommand="/usr [...]
./home/git/.ssh/authorized_keys
should then look somewhat like# SSH pubkey from git user ssh-rsa <Gitea Host Key> # other keys from users command="/usr/local/bin/gitea --config=/data/gitea/conf/app.ini serv key-1",no-port-forwarding,no-X11-forwarding,no-agent-forwarding,no-pty <user pubkey>
-
The next step is to create the fake host
gitea
command that will forward commands from the host to the container. The name of this file depends on your version of Gitea:-
For Gitea v1.16.0+. As an administrative user on the host run:
cat <<"EOF" | sudo tee /usr/local/bin/gitea #!/bin/sh ssh -p 2222 -o StrictHostKeyChecking=no git@127.0.0.1 "SSH_ORIGINAL_COMMAND=\"$SSH_ORIGINAL_COMMAND\" $0 $@" EOF sudo chmod +x /usr/local/bin/gitea
-
Here is a detailed explanation what is happening when a SSH request is made:
- The client adds their SSH public key to Gitea using the webpage.
- Gitea in the container will add an entry for this key to the
.ssh/authorized_keys
file of its running user,git
.- However, because
/home/git/.ssh/
on the host is mounted as/data/git/.ssh
this means that the key has been added to the hostgit
user'sauthorized_keys
file too.
- However, because
- This entry has the public key, but also has a
command=
option.- This command matches the location of the Gitea binary on the container, but also the location of the shim on the host.
- The client then makes an SSH request to the host SSH server using the
git
user, e.g.git clone git@domain:user/repo.git
. - The client will attempt to authenticate with the server, passing one or more public keys in turn to the host.
- For each key the client provides, the host SSH server will first check its configuration for an
AuthorizedKeysCommand
to see if the public key matches, and then the hostgit
user'sauthorized_keys
file.- Because
/home/git/.ssh/
on the host is mounted as/data/git/.ssh
this means that the key they added to the Gitea web will be found
- Because
- The first entry that matches will be selected, and assuming this is a Gitea entry, the
command=
will now be executed. - The host SSH server creates a user session for the
git
user, and using the shell for the hostgit
user runs thecommand=
- This means that the host runs the host
/usr/local/bin/gitea
shim that opens an SSH from the host to container passing the rest of the command arguments directly to/usr/local/bin/gitea
on the container. - Meaning that the container
gitea serv
is run, taking over control of the rest of the SSH session and managing gitea authentication & authorization of the git commands.
Notes
SSH container passthrough using authorized_keys
will work only if
opensshd
is used in the container- if
AuthorizedKeysCommand
is not used in combination withSSH_CREATE_AUTHORIZED_KEYS_FILE=false
to disable authorized files key generation LOCAL_ROOT_URL
is not changed (depending on the changes)
If you try to run gitea
on the host, you will attempt to ssh to the container and thence run the gitea
command there.
Never add the Gitea Host Key
as a SSH key to a user on the Gitea interface.
SSHing Shell (with authorized_keys)
In this option, the idea is that the host simply uses the authorized_keys
that gitea creates but at step 8 above we change the shell that the host runs to ssh directly into the docker and then run the shell there. This means that the gitea
that is then run is the real docker gitea
.
-
In this case we setup as per SSHing Shim except instead of creating
/usr/local/bin/gitea
we create a new shell for the git user. As an administrative user on the host run:cat <<"EOF" | sudo tee /home/git/ssh-shell #!/bin/sh shift ssh -p 2222 -o StrictHostKeyChecking=no git@127.0.0.1 "SSH_ORIGINAL_COMMAND=\"$SSH_ORIGINAL_COMMAND\" $@" EOF sudo chmod +x /home/git/ssh-shell sudo usermod -s /home/git/ssh-shell git
Be careful here - if you try to login as the git user in future you will ssh directly to the docker.
Here is a detailed explanation what is happening when a SSH request is made:
- The client adds their SSH public key to Gitea using the webpage.
- Gitea in the container will add an entry for this key to the
.ssh/authorized_keys
file of its running user,git
.- However, because
/home/git/.ssh/
on the host is mounted as/data/git/.ssh
this means that the key has been added to the hostgit
user'sauthorized_keys
file too.
- However, because
- This entry has the public key, but also has a
command=
option.- This command matches the location of the Gitea binary on the container.
- The client then makes an SSH request to the host SSH server using the
git
user, e.g.git clone git@domain:user/repo.git
. - The client will attempt to authenticate with the server, passing one or more public keys in turn to the host.
- For each key the client provides, the host SSH server will first check its configuration for an
AuthorizedKeysCommand
to see if the public key matches, and then the hostgit
user'sauthorized_keys
file.- Because
/home/git/.ssh/
on the host is mounted as/data/git/.ssh
this means that the key they added to the Gitea web will be found
- Because
- The first entry that matches will be selected, and assuming this is a Gitea entry, the
command=
will now be executed. - The host SSH server creates a user session for the
git
user, and using the shell for the hostgit
user runs thecommand=
- The shell of the host
git
user is now ourssh-shell
which opens an SSH connection from the host to container, (which opens a shell on the container for the containergit
). - The container shell now runs the
command=
option meaning that the containergitea serv
is run, taking over control of the rest of the SSH session and managing gitea authentication & authorization of the git commands.
Notes
SSH container passthrough using authorized_keys
will work only if
opensshd
is used in the container- if
AuthorizedKeysCommand
is not used in combination withSSH_CREATE_AUTHORIZED_KEYS_FILE=false
to disable authorized files key generation LOCAL_ROOT_URL
is not changed (depending on the changes)
If you try to login as the git
user on the host in future you will ssh directly to the docker.
Never add the Gitea Host Key
as a SSH key to a user on the Gitea interface.
Docker Shell (with authorized_keys)
Similar to the above ssh shell technique we can use a shell which simply uses docker exec
. As an administrative user on the host run:
cat <<"EOF" | sudo tee /home/git/docker-shell
#!/bin/sh
/usr/bin/docker exec -i -u git --env SSH_ORIGINAL_COMMAND="$SSH_ORIGINAL_COMMAND" gitea sh "$@"
EOF
sudo chmod +x /home/git/docker-shell
sudo usermod -s /home/git/docker-shell git
Here is a detailed explanation what is happening when a SSH request is made:
- The client adds their SSH public key to Gitea using the webpage.
- Gitea in the container will add an entry for this key to the
.ssh/authorized_keys
file of its running user,git
.- However, because
/home/git/.ssh/
on the host is mounted as/data/git/.ssh
this means that the key has been added to the hostgit
user'sauthorized_keys
file too.
- However, because
- This entry has the public key, but also has a
command=
option.- This command matches the location of the Gitea binary on the container.
- The client then makes an SSH request to the host SSH server using the
git
user, e.g.git clone git@domain:user/repo.git
. - The client will attempt to authenticate with the server, passing one or more public keys in turn to the host.
- For each key the client provides, the host SSH server will first check its configuration for an
AuthorizedKeysCommand
to see if the public key matches, and then the hostgit
user'sauthorized_keys
file.- Because
/home/git/.ssh/
on the host is mounted as/data/git/.ssh
this means that the key they added to the Gitea web will be found
- Because
- The first entry that matches will be selected, and assuming this is a Gitea entry, the
command=
will now be executed. - The host SSH server creates a user session for the
git
user, and using the shell for the hostgit
user runs thecommand=
- The shell of the host
git
user is now ourdocker-shell
which usesdocker exec
to open a shell for thegit
user on the container. - The container shell now runs the
command=
option meaning that the containergitea serv
is run, taking over control of the rest of the SSH session and managing gitea authentication & authorization of the git commands.
Note that gitea
in the docker command above is the name of the container. If you named yours differently, don't forget to change that. The host git
user also has to have
permission to run docker exec
.
Notes
Docker shell passthrough using authorized_keys
will work only if
opensshd
is used in the container- if
AuthorizedKeysCommand
is not used in combination withSSH_CREATE_AUTHORIZED_KEYS_FILE=false
to disable authorized files key generation LOCAL_ROOT_URL
is not changed (depending on the changes)
If you try to login as the git
user on the host in future you will docker exec
directly to the docker.
A Docker execing shim could be created similarly to above.
Docker Shell with AuthorizedKeysCommand
The AuthorizedKeysCommand route provides another option that does not require many changes to the compose file or the authorized_keys
- but does require changes to the host /etc/sshd_config
.
In this option, the idea is that the host SSH uses an AuthorizedKeysCommand
instead of relying on sharing the authorized_keys
file that gitea creates. We continue to use a special shell at step 8 above to exec into the docker and then run the shell there. This means that the gitea
that is then run is the real docker gitea
.
-
On the host create a
git
user with permission to rundocker exec
. -
We will again assume that the Gitea container is called
gitea
. -
Modify the
git
user's shell to forward commands to thesh
executable inside the container usingdocker exec
. As an administrative user on the host run:cat <<"EOF" | sudo tee /home/git/docker-shell #!/bin/sh /usr/bin/docker exec -i -u git --env SSH_ORIGINAL_COMMAND="$SSH_ORIGINAL_COMMAND" gitea sh "$@" EOF sudo chmod +x /home/git/docker-shell sudo usermod -s /home/git/docker-shell git
Now all attempts to login as the git
user on the host will be forwarded to the docker - including the SSH_ORIGINAL_COMMAND
. We now need to set-up SSH authentication on the host.
We will do this by leveraging the SSH AuthorizedKeysCommand to match the keys against those accepted by Gitea.
Add the following block to /etc/ssh/sshd_config
, on the host:
Match User git
AuthorizedKeysCommandUser git
AuthorizedKeysCommand /usr/bin/docker exec -i -u git gitea /usr/local/bin/gitea keys -c /data/gitea/conf/app.ini -e git -u %u -t %t -k %k
(From 1.16.0 you will not need to set the -c /data/gitea/conf/app.ini
option.)
Finally restart the SSH server. As an administrative user on the host run:
sudo systemctl restart sshd
Here is a detailed explanation what is happening when a SSH request is made:
- The client adds their SSH public key to Gitea using the webpage.
- Gitea in the container will add an entry for this key to its database.
- The client then makes an SSH request to the host SSH server using the
git
user, e.g.git clone git@domain:user/repo.git
. - The client will attempt to authenticate with the server, passing one or more public keys in turn to the host.
- For each key the client provides, the host SSH server will checks its configuration for an
AuthorizedKeysCommand
. - The host runs the above
AuthorizedKeysCommand
, which execs in to the docker and then runs thegitea keys
command. - Gitea on the docker will look in it's database to see if the public key matches and will return an entry like that of an
authorized_keys
command. - This entry has the public key, but also has a
command=
option which matches the location of the Gitea binary on the container. - The host SSH server creates a user session for the
git
user, and using the shell for the hostgit
user runs thecommand=
. - The shell of the host
git
user is now ourdocker-shell
which usesdocker exec
to open a shell for thegit
user on the container. - The container shell now runs the
command=
option meaning that the containergitea serv
is run, taking over control of the rest of the SSH session and managing gitea authentication & authorization of the git commands.
Notes
Docker shell passthrough using AuthorizedKeysCommand
will work only if
- The host
git
user is allowed to run thedocker exec
command.
If you try to login as the git
user on the host in future you will docker exec
directly to the docker.
A Docker execing shim could be created similarly to above.
SSH Shell with AuthorizedKeysCommand
Create a key for the host git
user as above, add it to the docker /data/git/.ssh/authorized_keys
then finally create and set the ssh-shell
as above.
Add the following block to /etc/ssh/sshd_config
, on the host:
Match User git
AuthorizedKeysCommandUser git
AuthorizedKeysCommand /usr/bin/ssh -p 2222 -o StrictHostKeyChecking=no git@127.0.0.1 /usr/local/bin/gitea keys -c /data/gitea/conf/app.ini -e git -u %u -t %t -k %k
(From 1.16.0 you will not need to set the -c /data/gitea/conf/app.ini
option.)
Finally restart the SSH server. As an administrative user on the host run:
sudo systemctl restart sshd
Here is a detailed explanation what is happening when a SSH request is made:
- The client adds their SSH public key to Gitea using the webpage.
- Gitea in the container will add an entry for this key to its database.
- The client then makes an SSH request to the host SSH server using the
git
user, e.g.git clone git@domain:user/repo.git
. - The client will attempt to authenticate with the server, passing one or more public keys in turn to the host.
- For each key the client provides, the host SSH server will checks its configuration for an
AuthorizedKeysCommand
. - The host runs the above
AuthorizedKeysCommand
, which will SSH in to the docker and then run thegitea keys
command. - Gitea on the docker will look in it's database to see if the public key matches and will return an entry like that of an
authorized_keys
command. - This entry has the public key, but also has a
command=
option which matches the location of the Gitea binary on the container. - The host SSH server creates a user session for the
git
user, and using the shell for the hostgit
user runs thecommand=
. - The shell of the host
git
user is now ourgit-shell
which uses SSH to open a shell for thegit
user on the container. - The container shell now runs the
command=
option meaning that the containergitea serv
is run, taking over control of the rest of the SSH session and managing gitea authentication & authorization of the git commands.
Notes
SSH container passthrough using AuthorizedKeysCommand
will work only if
opensshd
is running on the container
If you try to login as the git
user on the host in future you will ssh
directly to the docker.
Never add the Gitea Host Key
as a SSH key to a user on the Gitea interface.
SSHing shims could be created similarly to above.