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dev-guide: detect & use existing docker unit file

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Only create a new docker unit file if no other existing unit files
are detected. Creating a new docker file when not necessary may mask out
existing docker daemon configurations.

Fixes: #300

Signed-off-by: Marco Vedovati <mvedovati@suse.com>
This commit is contained in:
Marco Vedovati 2018-12-14 18:28:04 +01:00
parent 4cd5f2cbb8
commit 59ce0b3d4e
1 changed files with 8 additions and 9 deletions
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11
Developer-Guide.md
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@ -356,14 +356,13 @@ $ rm -rf "${tmpdir}"
# Run Kata Containers with Docker
## Update Docker configuration
## Update the Docker systemd unit file
```
$ dir=/etc/systemd/system/docker.service.d
$ file="$dir/kata-containers.conf"
$ sudo mkdir -p "$dir"
$ sudo test -e "$file" || echo -e "[Service]\nType=simple\nExecStart=\nExecStart=/usr/bin/dockerd -D --default-runtime runc" | sudo tee "$file"
$ sudo grep -q "kata-runtime=" $file || sudo sed -i 's!^\(ExecStart=[^$].*$\)!\1 --add-runtime kata-runtime=/usr/local/bin/kata-runtime!g' "$file"
$ dockerUnit=$(systemctl show -p FragmentPath docker.service | cut -d "=" -f 2)
$ unitFile=${dockerUnit:-/etc/systemd/system/docker.service.d/kata-containers.conf}
$ test -e "$unitFile" || { sudo mkdir -p "$(dirname $unitFile)"; echo -e "[Service]\nType=simple\nExecStart=\nExecStart=/usr/bin/dockerd -D --default-runtime runc" | sudo tee "$unitFile"; }
$ grep -q "kata-runtime=" $unitFile || sudo sed -i 's!^\(ExecStart=[^$].*$\)!\1 --add-runtime kata-runtime=/usr/local/bin/kata-runtime!g' "$unitFile"
$ sudo systemctl daemon-reload
$ sudo systemctl restart docker
```