Add a system containerd

This adds an independent system containerd for running internal
containers.

Signed-off-by: Justin Cormack <justin.cormack@docker.com>

alpine/packages/containerd/etc/init.d/containerd

@@ -0,0 +1,17 @@
+#!/sbin/openrc-run
+
+depend()
+{
+	after docker
+}
+
+start()
+{
+	ebegin "Running system containerd"
+
+	# set ulimits as high as possible
+	ulimit -n 1048576
+	ulimit -p unlimited
+
+	/usr/bin/containerd &
+}

alpine/packages/diagnostics/diagnostics

@@ -28,5 +28,9 @@ DOCKERPS=$(docker ps 2>&1)
 [ $? -eq 0 ] && printf "✓ Docker daemon working\n" || printf "✗ Docker ps failed: $DOCKERPS\n"
 DIAGNOSTICS=$(ps -eo args | grep '/usr/bin/diagnostics-server$')
 [ $? -eq 0 ] && printf "✓ Diagnostics server running: $DIAGNOSTICS\n" || printf "✗ No diagnostics server\n"
+CONTAINERD=$(ps -eo args | grep '/usr/bin/containerd$')
+[ $? -eq 0 ] && printf "✓ System containerd server running: $DIAGNOSTICS\n" || printf "✗ No containerd server\n"
+CONTAINERPS=$(containerd-ctr containers 2>&1)
+[ $? -eq 0 ] && printf "✓ System containerd working\n" || printf "✗ containerd failed: $CONTAINERPS\n"
 
 exit 0

alpine/packages/diagnostics/etc/init.d/diagnostics

@@ -2,7 +2,7 @@
 
 depend()
 {
-	after docker
+	after docker containerd
 }
 
 start()