Long overdue first commit with content

content/en/blog/docker/_index.md

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+---
+title: "Docker"
+linkTitle: "Docker"
+weight: 40
+---

content/en/blog/docker/cleaning.md

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+---
+title: "Cleaning a docker host"
+linkTitle: "Cleaning a docker host"
+date: 2018-01-29
+description: >
+  How to retrieve storage space by cleaning a docker host
+---
+
+Be carefull that this will delete any stopped container and remove any locally unused image and tags :
+{{< highlight sh >}}
+docker system prune -f -a
+{{< /highlight >}}

content/en/blog/docker/docker-compose-bridge.md

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+---
+title: "Docker compose predictable bridge"
+linkTitle: "Docker compose predictable bridge"
+date: 2018-09-25
+description: >
+  How to use a predefined bridge with docker compose
+---
+
+By default, docker-compose will create a network with a randomly named bridge. If you are like me using a strict firewall on all your machines, this just cannot work.
+
+You need to put your services in `network_mode: “bridge”` and add a custom `network` entry like :
+
+{{< highlight yaml >}}
+version: '3.0'
+
+services:
+  sshportal:
+    image: moul/sshportal
+    environment:
+      - SSHPORTAL_DEFAULT_ADMIN_INVITE_TOKEN=integration
+    command: server --debug
+    depends_on:
+      - testserver
+    ports:
+      - 2222
+    network_mode: "bridge"
+networks:
+  default:
+    external:
+      name: bridge
+{{< /highlight >}}

content/en/blog/docker/migrate-data-volume.md

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+---
+title: "Migrate a data volume"
+linkTitle: "Migrate a data volume"
+date: 2018-01-30
+description: >
+  How to migrate a data volume
+---
+
+Here is how to migrate a data volume between two of your hosts. A rsync of the proper `/var/lib/docker/volumes` subfolder would work just as well, but is here a fun way to do it with docker and pipes :
+{{< highlight sh >}}
+export VOLUME=tiddlywiki
+export DEST=10.1.0.242
+docker run --rm -v $VOLUME:/from alpine ash -c "cd /from ; tar -cpf - . " \
+| ssh $DEST "docker run --rm -i -v $VOLUME:/to alpine ash -c 'cd /to ; tar -xfp - ' "
+{{< /highlight >}}

content/en/blog/docker/shell-usage-in-dockerfile.md

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+---
+title: "Shell usage in dockerfile"
+linkTitle: "Shell usage in dockerfile"
+date: 2019-02-04
+description: >
+  How to use a proper shell in a dockerfile
+---
+
+The default shell is `[“/bin/sh”, “-c”]`, which doesn't handle pipe fails when chaining commands. To process errors when using pipes use this :
+
+{{< highlight sh >}}
+SHELL ["/bin/bash", "-eux", "-o", "pipefail", "-c"]
+{{< /highlight >}}
+
+## References
+- https://bearstech.com/societe/blog/securiser-et-optimiser-notre-liste-des-bonnes-pratiques-liees-aux-dockerfiles/