120 lines
4.2 KiB
Markdown
120 lines
4.2 KiB
Markdown
---
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description: "Set and configure Git protocol v2"
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---
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# Configuring Git Protocol v2
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> - [Introduced](https://gitlab.com/gitlab-org/gitlab-foss/issues/46555) in GitLab 11.4.
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> - [Temporarily disabled](https://gitlab.com/gitlab-org/gitlab-foss/issues/55769) in GitLab 11.5.8, 11.6.6, 11.7.1, and 11.8+.
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> - [Re-enabled](https://gitlab.com/gitlab-org/gitlab/issues/27828) in GitLab 12.8.
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Git protocol v2 improves the v1 wire protocol in several ways and is
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enabled by default in GitLab for HTTP requests. In order to enable SSH,
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further configuration is needed by the administrator.
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More details about the new features and improvements are available in
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the [Google Open Source Blog](https://opensource.googleblog.com/2018/05/introducing-git-protocol-version-2.html)
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and the [protocol documentation](https://github.com/git/git/blob/master/Documentation/technical/protocol-v2.txt).
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## Requirements
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From the client side, `git` `v2.18.0` or newer must be installed.
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From the server side, if we want to configure SSH we need to set the `sshd`
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server to accept the `GIT_PROTOCOL` environment.
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In installations using [GitLab Helm Charts](https://docs.gitlab.com/charts/)
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and [All-in-one docker image](https://docs.gitlab.com/omnibus/docker/), the SSH
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service is already configured to accept the `GIT_PROTOCOL` environment and users
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need not do anything more.
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For Omnibus GitLab and installations from source, you have to manually update
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the SSH configuration of your server by adding the line below to the `/etc/ssh/sshd_config` file:
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```plaintext
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AcceptEnv GIT_PROTOCOL
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```
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Once configured, restart the SSH daemon for the change to take effect:
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```shell
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# CentOS 6 / RHEL 6
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sudo service sshd restart
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# All other supported distributions
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sudo systemctl restart ssh
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```
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## Instructions
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In order to use the new protocol, clients need to either pass the configuration
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`-c protocol.version=2` to the Git command, or set it globally:
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```shell
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git config --global protocol.version 2
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```
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### HTTP connections
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Verify Git v2 is used by the client:
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```shell
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GIT_TRACE_CURL=1 git -c protocol.version=2 ls-remote https://your-gitlab-instance.com/group/repo.git 2>&1 | grep Git-Protocol
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```
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You should see that the `Git-Protocol` header is sent:
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```plaintext
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16:29:44.577888 http.c:657 => Send header: Git-Protocol: version=2
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```
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Verify Git v2 is used by the server:
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```shell
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GIT_TRACE_PACKET=1 git -c protocol.version=2 ls-remote https://your-gitlab-instance.com/group/repo.git 2>&1 | head
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```
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Example response using Git protocol v2:
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```shell
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$ GIT_TRACE_PACKET=1 git -c protocol.version=2 ls-remote https://your-gitlab-instance.com/group/repo.git 2>&1 | head
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10:42:50.574485 pkt-line.c:80 packet: git< # service=git-upload-pack
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10:42:50.574653 pkt-line.c:80 packet: git< 0000
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10:42:50.574673 pkt-line.c:80 packet: git< version 2
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10:42:50.574679 pkt-line.c:80 packet: git< agent=git/2.18.1
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10:42:50.574684 pkt-line.c:80 packet: git< ls-refs
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10:42:50.574688 pkt-line.c:80 packet: git< fetch=shallow
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10:42:50.574693 pkt-line.c:80 packet: git< server-option
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10:42:50.574697 pkt-line.c:80 packet: git< 0000
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10:42:50.574817 pkt-line.c:80 packet: git< version 2
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10:42:50.575308 pkt-line.c:80 packet: git< agent=git/2.18.1
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```
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### SSH Connections
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Verify Git v2 is used by the client:
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```shell
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GIT_SSH_COMMAND="ssh -v" git -c protocol.version=2 ls-remote ssh://your-gitlab-instance.com:group/repo.git 2>&1 |grep GIT_PROTOCOL
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```
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You should see that the `GIT_PROTOCOL` environment variable is sent:
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```plaintext
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debug1: Sending env GIT_PROTOCOL = version=2
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```
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For the server side, you can use the [same examples from HTTP](#http-connections), changing the
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URL to use SSH.
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### Observe Git protocol version of connections
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To observe what Git protocol versions are being used in a
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production environment, you can use the following Prometheus query:
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```prometheus
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sum(rate(gitaly_git_protocol_requests_total[1m])) by (grpc_method,git_protocol,grpc_service)
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```
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You can view what Git protocol versions are being used on GitLab.com at
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<https://dashboards.gitlab.com/d/pqlQq0xik/git-protocol-versions>.
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