├── Makefile
├── Dockerfile
└── dind


/Makefile:
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1 | 
2 | build:
3 | 	docker build -t progrium/dind .
4 | 


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/Dockerfile:
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1 | FROM gliderlabs/alpine:3.2
2 | RUN apk-install iptables ca-certificates lxc e2fsprogs bash docker
3 | ADD ./dind /bin/dind
4 | VOLUME /var/lib/docker
5 | ENV DOCKER_OPTS -H unix:///var/run/docker.sock
6 | ENTRYPOINT ["/bin/dind"]
7 | 


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/dind:
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 1 | #!/bin/bash
 2 | 
 3 | CGROUP=/sys/fs/cgroup
 4 | mkdir -p $CGROUP
 5 | if ! mountpoint -q $CGROUP; then
 6 | 	mount -n -t tmpfs -o uid=0,gid=0,mode=0755 cgroup $CGROUP || {
 7 | 		echo "Could not make a tmpfs mount. Did you use --privileged?"
 8 | 		exit 1
 9 | 	}
10 | fi
11 | 
12 | if [[ -d /sys/kernel/security ]] && ! mountpoint -q /sys/kernel/security; then
13 |   mount -t securityfs none /sys/kernel/security || {
14 |     echo "Could not mount /sys/kernel/security."
15 |     echo "AppArmor detection and --privileged mode might break."
16 |   }
17 | fi
18 | 
19 | for SUBSYS in $(cut -d: -f2 /proc/1/cgroup); do
20 |   mkdir -p $CGROUP/$SUBSYS
21 |   if ! mountpoint -q $CGROUP/$SUBSYS; then
22 |     mount -n -t cgroup -o $SUBSYS cgroup $CGROUP/$SUBSYS
23 |   fi
24 | 
25 |   echo $SUBSYS | grep -q ^name= && {
26 |     NAME=$(echo $SUBSYS | sed s/^name=//)
27 |     ln -s $SUBSYS $CGROUP/$NAME
28 |   }
29 | 
30 |   [[ $SUBSYS = cpuacct,cpu ]] && ln -s $SUBSYS $CGROUP/cpu,cpuacct
31 | done
32 | 
33 | grep -q :devices: /proc/1/cgroup ||
34 | 	echo "WARNING: the 'devices' cgroup should be in its own hierarchy."
35 | grep -qw devices /proc/1/cgroup ||
36 | 	echo "WARNING: it looks like the 'devices' cgroup is not mounted."
37 | 
38 | pushd /proc/self/fd >/dev/null
39 | for FD in *; do
40 | 	case "$FD" in
41 | 	[012]) ;;
42 | 	*) eval exec "$FD>&-" ;;
43 | 	esac
44 | done
45 | popd >/dev/null
46 | 
47 | rm -rf /var/run/docker.pid
48 | exec docker -d $DOCKER_OPTS $@
49 | 


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