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ansible: podman: use fuse-overlayfs

The default driver "vfs" leads to container crashes on heavy i/o load
on our jenkins machines. Use "fuse-overlayfs" instead, which does not
have these problems.

Add a systemd service that creates /dev/fuse when the LXC container
starts and configure the driver via ~/.config/containers/storage.conf.

Note: when changing the storage driver, the previous storage database
needs to be removed (~/.local/share/containers/storage/). I've done
this manually before rolling out this change.

Fixes: OS#6524
Change-Id: Ib67d5cbc7d567efed673e2e646ae5b903c49e928
---
A ansible/roles/podman/files/mknod-fuse.service
A ansible/roles/podman/files/storage.conf
M ansible/roles/podman/tasks/main.yml
3 files changed, 35 insertions(+), 0 deletions(-)

git pull ssh://gerrit.osmocom.org:29418/osmo-ci refs/changes/96/37896/1

diff --git a/ansible/roles/podman/files/mknod-fuse.service b/ansible/roles/podman/files/mknod-fuse.service
new file mode 100644
index 0000000..b796f4f
--- /dev/null
+++ b/ansible/roles/podman/files/mknod-fuse.service
@@ -0,0 +1,9 @@
+[Unit]
+Description=Create /dev/fuse (OS#6524)
+
+[Service]
+ExecStart=sh -c 'test -e /dev/fuse || mknod -m 666 /dev/fuse c 10 229'
+RemainAfterExit=true
+
+[Install]
+WantedBy=multi-user.target
diff --git a/ansible/roles/podman/files/storage.conf b/ansible/roles/podman/files/storage.conf
new file mode 100644
index 0000000..f212591
--- /dev/null
+++ b/ansible/roles/podman/files/storage.conf
@@ -0,0 +1,5 @@
+[storage]
+driver = "overlay"
+
+[storage.options]
+mount_program = "/usr/bin/fuse-overlayfs"
diff --git a/ansible/roles/podman/tasks/main.yml b/ansible/roles/podman/tasks/main.yml
index 45a712d..102b37e 100644
--- a/ansible/roles/podman/tasks/main.yml
+++ b/ansible/roles/podman/tasks/main.yml
@@ -5,5 +5,26 @@
     pkg:
       - podman
       - buildah
+      - fuse-overlayfs
     # Has reasonable recommends needed for dns resolving etc.
     install_recommends: yes
+
+- name: install mknod-fuse.service
+  copy:
+    src: mknod-fuse.service
+    dest: /etc/systemd/system/
+    mode: 0644
+
+- name: enable mknod-fuse.service
+  systemd_service:
+    daemon_reload: true
+    name: mknod-fuse
+    enabled: true
+    state: started
+
+- name: install storage.conf
+  copy:
+    src: storage.conf
+    dest: "/home/{{ jenkins_user }}/.config/containers/"
+    mode: 0644
+    owner: "{{ jenkins_user }}"

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