GitlabCI build failed, docker.sock: write: broken pipe
<p>I was trying to implement a new CI workflow using GitlabCI but now I can't understand the issue. I followed <a href="https://gitlab.com/help/ci/docker/using_docker_build.md" rel="nofollow">this doc</a> and I choose the Docker socket binding method.</p>

<p>Everything is running on the same machine, a RancherOS :</p>

<pre><code>$ uname -a    
Linux xxx 4.2.8-ckt4-rancher #1 SMP Tue Apr 5 16:12:00 UTC 2016 x86_64 x86_64 x86_64 GNU/Linux

$ docker ps
CONTAINER ID        IMAGE                         COMMAND                  CREATED             STATUS              PORTS                                      NAMES
57801c725226        gitlab/gitlab-runner:latest   "/usr/bin/dumb-init /"   14 hours ago        Up 14 hours                                                    gitlab-runner
50e3a9dabe77        gitlab/gitlab-ce              "/assets/wrapper"        17 hours ago        Up 17 hours         80/tcp, 443/tcp, 0.0.0.0:1022-&gt;22/tcp      gitlab
ed2b6d9a8ea7        jwilder/nginx-proxy           "/app/docker-entrypoi"   6 days ago          Up 3 days           0.0.0.0:80-&gt;80/tcp, 0.0.0.0:443-&gt;443/tcp   proxy
</code></pre>

<p>Run command of the runner's container</p>

<pre><code>$ docker run -d --name gitlab-runner --restart always \
-v ~/docker/gitlab-runner/config:/etc/gitlab-runner \
-v /var/run/docker.sock:/var/run/docker.sock \
gitlab/gitlab-runner:latest
</code></pre>

<p>Runner's config</p>

<pre><code>$ sudo cat ~/docker/gitlab-runner/config/config.toml 
concurrent = 1
check_interval = 0

[[runners]]
  name = "ITrancher, docker based runner 4"
  url = "https://git.xxx.com"
  token = "xxx"
  executor = "docker"
  [runners.docker]
    tls_verify = false
    image = "docker:latest"
    privileged = false
    disable_cache = false
    volumes = ["/var/run/docker.sock:/var/run/docker.sock", "/cache"]
  [runners.cache]
  [runners.kubernetes]
    host = ""
    cert_file = ""
    key_file = ""
    ca_file = ""
    image = ""
    namespace = ""
    privileged = false
    cpus = ""
    memory = ""
    service_cpus = ""
    service_memory = ""
</code></pre>

<p>Here is my .gitlab-ci.yml file
</p>

<pre><code>image: docker:latest
before_script:
- docker login -u gitlab-ci-token -p $CI_BUILD_TOKEN registry.xxx.com
stages:
- build
build:
  stage: build
  script:
  - docker build --pull -f Dockerfile-php -t registry.xxx.com/dev/kayako-php:latest .
  - docker push registry.xxx.com/dev/kayako-php:latest
  - docker build --pull -f Dockerfile-nginx -t registry.xxx.com/dev/kayako-nginx:latest .
  - docker push registry.xxx.com/dev/kayako-nginx:latest
</code></pre>

<p>And this is what I get into GitlabCI when the build is hooked</p>

<pre><code>Running with gitlab-ci-multi-runner 1.6.1 (c52ad4f)
Using Docker executor with image docker:latest ...
ERROR: Failed to create container volume for /builds/dev write unix @-&gt;/var/run/docker.sock: write: broken pipe
ERROR: Preparation failed: write unix @-&gt;/var/run/docker.sock: write: broken pipe
Will be retried in 3s ...
Using Docker executor with image docker:latest ...
ERROR: Failed to create container volume for /builds/dev write unix @-&gt;/var/run/docker.sock: write: broken pipe
ERROR: Preparation failed: write unix @-&gt;/var/run/docker.sock: write: broken pipe
Will be retried in 3s ...
Using Docker executor with image docker:latest ...
ERROR: Failed to create container volume for /builds/dev write unix @-&gt;/var/run/docker.sock: write: broken pipe
ERROR: Preparation failed: write unix @-&gt;/var/run/docker.sock: write: broken pipe
Will be retried in 3s ...
ERROR: Build failed (system failure): write unix @-&gt;/var/run/docker.sock: write: broken pipe
</code></pre>

<p>And this is the output when I try to run the build locally with <code>--debug</code> flag inside my gitlab-runner container.</p>

<pre><code># gitlab-runner --debug exec docker build
Runtime platform                                    arch=amd64 os=linux revision=c52ad4f version=1.6.1
Running with gitlab-ci-multi-runner 1.6.1 (c52ad4f)
Shell configuration: environment: []
dockercommand:
- sh
- -c
- "if [ -x /usr/local/bin/bash ]; then\n\texec /usr/local/bin/bash \nelif [ -x /usr/bin/bash
  ]; then\n\texec /usr/bin/bash \nelif [ -x /bin/bash ]; then\n\texec /bin/bash \nelif
  [ -x /usr/local/bin/sh ]; then\n\texec /usr/local/bin/sh \nelif [ -x /usr/bin/sh
  ]; then\n\texec /usr/bin/sh \nelif [ -x /bin/sh ]; then\n\texec /bin/sh \nelse\n\techo
  shell not found\n\texit 1\nfi\n\n"
command: bash
arguments: []
passfile: false
extension: ""
  build=1 project=1
Using Docker executor with image docker:latest ...
Applying docker.Client transport fix: &amp;{false 0xc820306810 &lt;nil&gt; 0xc820238320 unix:///var/run/docker.sock 0xc820232780 0xc820340ba0 [1 18] [] [] &lt;nil&gt;}  host=unix:///var/run/docker.sock
Creating build volume...                            build=1 project=1
Looking for prebuilt image gitlab-runner-prebuilt-x86_64:c52ad4f ...  build=1 project=1
Loading prebuilt image...                           build=1 project=1
Closed all idle connections for docker.Client: &amp;{false 0xc820306900 &lt;nil&gt; 0x39d9ee0 unix:///var/run/docker.sock 0xc820232780 0xc820340ba0 [1 18] [1 22] [1 18] 0xc820306930} 
ERROR: Preparation failed: write unix @-&gt;/var/run/docker.sock: write: broken pipe
Will be retried in 3s ...
Shell configuration: environment: []
dockercommand:
- sh
- -c
- "if [ -x /usr/local/bin/bash ]; then\n\texec /usr/local/bin/bash \nelif [ -x /usr/bin/bash
  ]; then\n\texec /usr/bin/bash \nelif [ -x /bin/bash ]; then\n\texec /bin/bash \nelif
  [ -x /usr/local/bin/sh ]; then\n\texec /usr/local/bin/sh \nelif [ -x /usr/bin/sh
  ]; then\n\texec /usr/bin/sh \nelif [ -x /bin/sh ]; then\n\texec /bin/sh \nelse\n\techo
  shell not found\n\texit 1\nfi\n\n"
command: bash
arguments: []
passfile: false
extension: ""
  build=1 project=1
Using Docker executor with image docker:latest ...
Applying docker.Client transport fix: &amp;{false 0xc820306900 &lt;nil&gt; 0x39d9ee0 unix:///var/run/docker.sock 0xc820232780 0xc820340ba0 [1 18] [1 22] [1 18] 0xc820306930}  host=unix:///var/run/docker.sock
Creating build volume...                            build=1 project=1
Looking for prebuilt image gitlab-runner-prebuilt-x86_64:c52ad4f ...  build=1 project=1
Loading prebuilt image...                           build=1 project=1
Closed all idle connections for docker.Client: &amp;{false 0xc8203072f0 &lt;nil&gt; 0x39d9ee0 unix:///var/run/docker.sock 0xc820232780 0xc820340ba0 [1 18] [1 22] [1 18] 0xc820306930} 
ERROR: Preparation failed: write unix @-&gt;/var/run/docker.sock: write: broken pipe
Will be retried in 3s ...
Shell configuration: environment: []
dockercommand:
- sh
- -c
- "if [ -x /usr/local/bin/bash ]; then\n\texec /usr/local/bin/bash \nelif [ -x /usr/bin/bash
  ]; then\n\texec /usr/bin/bash \nelif [ -x /bin/bash ]; then\n\texec /bin/bash \nelif
  [ -x /usr/local/bin/sh ]; then\n\texec /usr/local/bin/sh \nelif [ -x /usr/bin/sh
  ]; then\n\texec /usr/bin/sh \nelif [ -x /bin/sh ]; then\n\texec /bin/sh \nelse\n\techo
  shell not found\n\texit 1\nfi\n\n"
command: bash
arguments: []
passfile: false
extension: ""
  build=1 project=1
Using Docker executor with image docker:latest ...
Applying docker.Client transport fix: &amp;{false 0xc8203072f0 &lt;nil&gt; 0x39d9ee0 unix:///var/run/docker.sock 0xc820232780 0xc820340ba0 [1 18] [1 22] [1 18] 0xc820306930}  host=unix:///var/run/docker.sock
Creating build volume...                            build=1 project=1
Looking for prebuilt image gitlab-runner-prebuilt-x86_64:c52ad4f ...  build=1 project=1
Loading prebuilt image...                           build=1 project=1
Closed all idle connections for docker.Client: &amp;{false 0xc820307a10 &lt;nil&gt; 0x39d9ee0 unix:///var/run/docker.sock 0xc820232780 0xc820340ba0 [1 18] [1 22] [1 18] 0xc820306930} 
ERROR: Preparation failed: write unix @-&gt;/var/run/docker.sock: write: broken pipe
Will be retried in 3s ...
ERROR: Build failed (system failure): write unix @-&gt;/var/run/docker.sock: write: broken pipe
FATAL: write unix @-&gt;/var/run/docker.sock: write: broken pipe 
</code></pre>

<p>But my docker.sock binding seems to be ok :</p>

<pre><code># echo -e "GET /containers/json HTTP/1.0\r\n" | nc -U /var/run/docker.sock
HTTP/1.0 200 OK
Content-Type: application/json
Server: Docker/1.10.3 (linux)
Date: Wed, 19 Oct 2016 10:22:58 GMT

[{json is ok}]
</code></pre>

<p>Anyone has an idea ?</p>