From 6e71762b2047e28d07e1ea87b712e2bbe424ec4b Mon Sep 17 00:00:00 2001
From: jalr <mail@jalr.de>
Date: Sat, 12 May 2018 22:08:02 +0200
Subject: [PATCH] Setup LVM before starting docker daemon

---
 .../roles/docker/files/docker-override.conf   |  2 +
 .../roles/docker/files/docker-setup.sh        | 46 +++++++++++++++++++
 .../roles/docker/tasks/lvm-setup-service.yml  | 25 ++++++++++
 packer/ansible/roles/docker/tasks/main.yml    |  4 ++
 4 files changed, 77 insertions(+)
 create mode 100644 packer/ansible/roles/docker/files/docker-override.conf
 create mode 100755 packer/ansible/roles/docker/files/docker-setup.sh
 create mode 100644 packer/ansible/roles/docker/tasks/lvm-setup-service.yml

diff --git a/packer/ansible/roles/docker/files/docker-override.conf b/packer/ansible/roles/docker/files/docker-override.conf
new file mode 100644
index 0000000..4f44627
--- /dev/null
+++ b/packer/ansible/roles/docker/files/docker-override.conf
@@ -0,0 +1,2 @@
+[Service]
+ExecStartPre=/usr/local/sbin/docker-setup.sh
diff --git a/packer/ansible/roles/docker/files/docker-setup.sh b/packer/ansible/roles/docker/files/docker-setup.sh
new file mode 100755
index 0000000..7e34a45
--- /dev/null
+++ b/packer/ansible/roles/docker/files/docker-setup.sh
@@ -0,0 +1,46 @@
+#!/bin/sh
+
+vg='vglab'
+
+if ! lvs -o layout --noheadings $vg/docker-thinpool | grep -q 'thin,pool'; then
+
+	if ! lvs -o LV_NAME --noheadings | grep -q docker-thinpool; then
+		lvcreate --wipesignatures y -n docker-thinpool "$vg" -l 10%VG
+	fi
+
+	if ! lvs -o LV_NAME --noheadings | grep -q docker-thinpoolmeta; then
+		lvcreate --wipesignatures y -n docker-thinpoolmeta "$vg" -l 1%VG
+	fi
+
+	lvconvert -y \
+		--zero n \
+		-c 512K \
+		--thinpool "$vg/docker-thinpool" \
+		--poolmetadata "$vg/docker-thinpoolmeta"
+fi
+
+if ! [ -f /etc/lvm/profile/docker-thinpool.profile ]; then
+	[ -d /etc/lvm/profile ] || mkdir /etc/lvm/profile
+	cat > /etc/lvm/profile/docker-thinpool.profile << EOF
+activation {
+  thin_pool_autoextend_threshold=80
+  thin_pool_autoextend_percent=20
+}
+EOF
+	lvchange --metadataprofile docker-thinpool "$vg/docker-thinpool"
+	lvs -o+seg_monitor
+fi
+
+lv_path=$(lvm lvs "$vg/docker-thinpool" -o LV_PATH --noheadings | sed 's/\s//g')
+
+cat > /etc/docker/daemon.json << EOF
+{
+    "storage-driver": "devicemapper",
+    "storage-opts": [
+    "dm.thinpooldev=$lv_path",
+    "dm.use_deferred_removal=true",
+    "dm.use_deferred_deletion=true"
+    ]
+}
+EOF
+
diff --git a/packer/ansible/roles/docker/tasks/lvm-setup-service.yml b/packer/ansible/roles/docker/tasks/lvm-setup-service.yml
new file mode 100644
index 0000000..b221ef6
--- /dev/null
+++ b/packer/ansible/roles/docker/tasks/lvm-setup-service.yml
@@ -0,0 +1,25 @@
+---
+- name: copy docker-setup script
+  copy:
+    src: docker-setup.sh
+    dest: /usr/local/sbin/docker-setup.sh
+    owner: root
+    group: root
+    mode: "0744"
+
+- name: create override directory for docker service unit
+  file:
+    path: /etc/systemd/system/docker.service.d
+    state: directory
+    mode: "0755"
+    owner: root
+    group: root
+
+- name: copy systemd unit override for docker service
+  copy:
+    src: docker-override.conf
+    dest: /etc/systemd/system/docker.service.d/override.conf
+    owner: root
+    group: root
+    mode: "0644"
+
diff --git a/packer/ansible/roles/docker/tasks/main.yml b/packer/ansible/roles/docker/tasks/main.yml
index 460e943..f9b4a60 100644
--- a/packer/ansible/roles/docker/tasks/main.yml
+++ b/packer/ansible/roles/docker/tasks/main.yml
@@ -2,3 +2,7 @@
 - import_tasks: packages.yml
   tags:
     - docker:packages
+
+- import_tasks: lvm-setup-service.yml
+  tags:
+    - docker:lvm-setup-service