Add DOCKER_RAMDISK environment variable to make Docker work when the …

…root is on a ramdisk, closes #83

CHANGELOG.md

@@ -19,6 +19,7 @@ This release includes Docker 0.9.0 changes and defaults, such as setting exec_dr
 * Enhancement: [#81][]: Docker 0.9.0: Add a -G option to specify the group which unix sockets belong
 * Enhancement: [#82][]: Docker 0.9.0: Add -f flag to docker rm to force removal of running containers
 * Enhancement: Add -f flag for docker rmi to force removal of images
+* Enhancement: [#83][]: Docker 0.9.0: Add DOCKER_RAMDISK environment variable to make Docker work when the root is on a ramdisk
 * Enhancement: [#84][]: Docker 0.9.0: Add -e flag for execution driver
 * Enhancement: [#86][]: Add Chefspec LWRP matchers
 
@@ -361,6 +362,7 @@ Lots of community contributions this release -- thanks!
 [#78]: https://github.com/bflad/chef-docker/issues/78
 [#81]: https://github.com/bflad/chef-docker/issues/81
 [#82]: https://github.com/bflad/chef-docker/issues/82
+[#83]: https://github.com/bflad/chef-docker/issues/83
 [#84]: https://github.com/bflad/chef-docker/issues/84
 [#86]: https://github.com/bflad/chef-docker/issues/86
 [@jcrobak]: https://github.com/jcrobak

README.md

@@ -63,6 +63,7 @@ init_type | Init type for docker ("runit", "systemd", "sysv", or "upstart") | St
 install_dir | Installation directory for docker binary | String | auto-detected (see attributes/default.rb)
 install_type | Installation type for docker ("binary", "package" or "source") | String | "package"
 options | Additional options to pass to docker. These could be flags like "-api-enable-cors". | String | nil
+ramdisk | Set DOCKER_RAMDISK when using RAM disk | TrueClass or FalseClass | false
 registry_cmd_timeout | registry LWRP default cmd_timeout seconds | Fixnum | 60
 storage_driver | Storage driver for docker (nil, "aufs", or "devicemapper") | String | auto-detected (see attributes/default.rb)
 version | Version of docker | String | nil

attributes/default.rb

@@ -21,6 +21,7 @@
 default['docker']['group_members'] = []
 default['docker']['http_proxy'] = nil
 default['docker']['image_cmd_timeout'] = 300
+default['docker']['ramdisk'] = false
 default['docker']['registry_cmd_timeout'] = 60
 
 default['docker']['init_type'] = value_for_platform(

templates/default/docker.service.erb

@@ -5,6 +5,9 @@ After=network.target
 
 [Service]
 Type=simple
+<% if node['docker']['ramdisk'] -%>
+Environment="DOCKER_RAMDISK=<%= node['docker']['ramdisk'] %>"
+<% end -%>
 <% if node['docker']['http_proxy'] -%>
 Environment="HTTP_PROXY=<%= node['docker']['http_proxy'] %>"
 <% end -%>

templates/default/docker.sysconfig.erb

@@ -26,6 +26,10 @@ DOCKER_OPTS="$DOCKER_OPTS -e <%= node['docker']['exec_driver'] %>"
 DOCKER_OPTS="$DOCKER_OPTS -G <%= node['docker']['group'] %>"
 <% end -%>
 
+<% if node['docker']['ramdisk'] -%>
+DOCKER_RAMDISK=<%= node['docker']['ramdisk'] %>
+<% end -%>
+
 # If you need Docker to use an HTTP proxy, it can also be specified here.
 <% if node['docker']['http_proxy'] -%>
 export HTTP_PROXY=<%= node['docker']['http_proxy'] %>

templates/default/sv-docker-run.erb

@@ -1,5 +1,8 @@
 #!/bin/sh
 exec 2>&1
+<% if node['docker']['ramdisk'] -%>
+export DOCKER_RAMDISK=<%= node['docker']['ramdisk'] %>
+<% end -%>
 <% if node['docker']['http_proxy'] -%>
 export HTTP_PROXY=<%= node['docker']['http_proxy'] %>
 <% end -%>