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synced 2022-11-09 12:21:53 -05:00
56 lines
1.3 KiB
Bash
56 lines
1.3 KiB
Bash
#!/bin/bash
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# First, make sure that cgroups are mounted correctly.
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CGROUP=/sys/fs/cgroup
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[ -d $CGROUP ] ||
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mkdir $CGROUP
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mountpoint -q $CGROUP ||
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mount -n -t tmpfs -o uid=0,gid=0,mode=0755 cgroup $CGROUP || {
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echo "Could not make a tmpfs mount. Did you use -privileged?"
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exit 1
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}
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# Mount the cgroup hierarchies exactly as they are in the parent system.
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for SUBSYS in $(cut -d: -f2 /proc/1/cgroup)
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do
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[ -d $CGROUP/$SUBSYS ] || mkdir $CGROUP/$SUBSYS
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mountpoint -q $CGROUP/$SUBSYS ||
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mount -n -t cgroup -o $SUBSYS cgroup $CGROUP/$SUBSYS
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done
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# Note: as I write those lines, the LXC userland tools cannot setup
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# a "sub-container" properly if the "devices" cgroup is not in its
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# own hierarchy. Let's detect this and issue a warning.
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grep -q :devices: /proc/1/cgroup ||
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echo "WARNING: the 'devices' cgroup should be in its own hierarchy."
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grep -qw devices /proc/1/cgroup ||
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echo "WARNING: it looks like the 'devices' cgroup is not mounted."
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# Now, close extraneous file descriptors.
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pushd /proc/self/fd
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for FD in *
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do
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case "$FD" in
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# Keep stdin/stdout/stderr
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[012])
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;;
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# Nuke everything else
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*)
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eval exec "$FD>&-"
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;;
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esac
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done
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popd
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# If we were given a PORT environment variable, start as a simple daemon;
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# otherwise, spawn a shell as well
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if [ "$PORT" ]
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then
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exec docker -d -H 0.0.0.0:$PORT
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else
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docker -d &
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exec bash
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fi
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