"See this docker container? I wish I could run another one just like it,
but I'll be damned if I'm going to type all those command-line switches manually!"
This is what runlike does. You give it a docker container, it outputs the command line necessary to run another one just like it, along with all those pesky options (ports, links, volumes, ...). It's a real time saver for those that normally deploy their docker containers via some CM tool like Ansible/Chef and then find themselves needing to manually re-run some container.
Usage
runlike <container-name>
This prints out what you need to run to get a similar container. You can do $(runlike container-name) to simply execute its output in one step.
-p breaks the command line down to nice, pretty lines. For example:
$ runlike -p redis
docker run \
--name=redis \
-e "PATH=/usr/local/sbin:/usr/local/bin:/usr/sbin:/usr/bin:/sbin:/bin" \
-e "REDIS_VERSION=2.8.9" \
-e "REDIS_DOWNLOAD_URL=http://download.redis.io/releases/redis-2.8.9.tar.gz" \
-e "REDIS_DOWNLOAD_SHA1=003ccdc175816e0a751919cf508f1318e54aac1e" \
-p 0.0.0.0:6379:6379/tcp \
--detach=true \
myrepo/redis:7860c450dbee9878d5215595b390b9be8fa94c89 \
redis-server --slaveof 172.31.17.84 6379
Feeding it the output of docker inspect also works:
docker inspect <container-name> | runlike --stdin
--no-name will omit the container name from the output (to avoid collisions).
Run without installing
runlike is packaged as a Docker image: assaflavie/runlike.
docker run --rm -v /var/run/docker.sock:/var/run/docker.sock \
assaflavie/runlike YOUR-CONTAINER
You can also run it with an alias by adding the following to your ~/.profile or ~/.bashrc:
alias runlike="docker run --rm -v /var/run/docker.sock:/var/run/docker.sock assaflavie/runlike"
Now runlike should be available as a local command:
runlike YOUR-CONTAINER
Install
$ pip install runlike
Status
This is very much a work in progress. Many docker run options aren't yet supported, but the most commonly used ones are. Feel free to send pull requests if you add any or if you happen to fix any (of the many) bugs this package undoubtedly has.
Probably shouldn't use this in production yet. If you do, double check that it's actually running what you want it to run.
Supported Run Options
--add-host list Add a custom host-to-IP mapping
(host:ip)
--cap-add list Add Linux capabilities
--cap-drop list Drop Linux capabilities
(0-3, 0,1)
--cpuset-cpus string CPUs in which to allow execution
(0-3, 0,1)
--cpuset-mems string MEMs in which to allow execution
-d, --detach Run container in background and
print container ID
--device list Add a host device to the container
--dns list Set custom DNS servers
-e, --env list Set environment variables
--expose list Expose a port or a range of ports
-h, --hostname string Container host name
--mac-address string Container MAC address (e.g.,
92:d0:c6:0a:29:33)
-l, --label list Set meta data on a container
--log-driver string Logging driver for the container
--log-opt list Log driver options
--link list Add link to another container
-m, --memory bytes Memory limit
--memory-reservation bytes Memory soft limit
--name string Assign a name to the container
--network string Connect a container to a network
(default "default")
--pid string PID namespace to use
--privileged Give extended privileges to this
container
-p, --publish list Publish a container's port(s) to
the host
--restart string Restart policy to apply when a
container exits (default "no")
--rm Automatically remove the container
when it exits
--runtime string Runtime to use for this container
-t, --tty Allocate a pseudo-TTY
-u, --user string Username or UID (format:
<name|uid>[:<group|gid>])
-v, --volume list Bind mount a volume
--volumes-from list Mount volumes from the specified
container(s)
-w, --workdir string Working directory inside the container
Not Yet Supported Run Options (PRs are most welcome!)
-a, --attach list Attach to STDIN, STDOUT or STDERR
--blkio-weight uint16 Block IO (relative weight),
between 10 and 1000, or 0 to
disable (default 0)
--blkio-weight-device list Block IO weight (relative device
weight) (default [])
--cgroup-parent string Optional parent cgroup for the
container
--cidfile string Write the container ID to the file
--cpu-count int CPU count (Windows only)
--cpu-percent int CPU percent (Windows only)
--cpu-period int Limit CPU CFS (Completely Fair
Scheduler) period
--cpu-quota int Limit CPU CFS (Completely Fair
Scheduler) quota
--cpu-rt-period int Limit CPU real-time period in
microseconds
--cpu-rt-runtime int Limit CPU real-time runtime in
microseconds
-c, --cpu-shares int CPU shares (relative weight)
--cpus decimal Number of CPUs
--detach-keys string Override the key sequence for
detaching a container
--device-cgroup-rule list Add a rule to the cgroup allowed
devices list
--device-read-bps list Limit read rate (bytes per second)
from a device (default [])
--device-read-iops list Limit read rate (IO per second)
from a device (default [])
--device-write-bps list Limit write rate (bytes per
second) to a device (default [])
--device-write-iops list Limit write rate (IO per second)
to a device (default [])
--disable-content-trust Skip image verification (default true)
--dns-option list Set DNS options
--dns-search list Set custom DNS search domains
--entrypoint string Overwrite the default ENTRYPOINT
of the image
--env-file list Read in a file of environment variables
--group-add list Add additional groups to join
--health-cmd string Command to run to check health
--health-interval duration Time between running the check
(ms|s|m|h) (default 0s)
--health-retries int Consecutive failures needed to
report unhealthy
--health-start-period duration Start period for the container to
initialize before starting
health-retries countdown
(ms|s|m|h) (default 0s)
--health-timeout duration Maximum time to allow one check to
run (ms|s|m|h) (default 0s)
--help Print usage
--init Run an init inside the container
that forwards signals and reaps
processes
-i, --interactive Keep STDIN open even if not attached
--io-maxbandwidth bytes Maximum IO bandwidth limit for the
system drive (Windows only)
--io-maxiops uint Maximum IOps limit for the system
drive (Windows only)
--ip string IPv4 address (e.g., 172.30.100.104)
--ip6 string IPv6 address (e.g., 2001:db8::33)
--ipc string IPC mode to use
--isolation string Container isolation technology
--kernel-memory bytes Kernel memory limit
--label-file list Read in a line delimited file of labels
--link-local-ip list Container IPv4/IPv6 link-local
addresses
--memory-swap bytes Swap limit equal to memory plus
swap: '-1' to enable unlimited swap
--memory-swappiness int Tune container memory swappiness
(0 to 100) (default -1)
--mount mount Attach a filesystem mount to the
container
--network-alias list Add network-scoped alias for the
container
--no-healthcheck Disable any container-specified
HEALTHCHECK
--oom-kill-disable Disable OOM Killer
--oom-score-adj int Tune host's OOM preferences (-1000
to 1000)
--pids-limit int Tune container pids limit (set -1
for unlimited)
--platform string Set platform if server is
multi-platform capable
-P, --publish-all Publish all exposed ports to
random ports
--read-only Mount the container's root
filesystem as read only
--security-opt list Security Options
--shm-size bytes Size of /dev/shm
--sig-proxy Proxy received signals to the
process (default true)
--stop-signal string Signal to stop a container
(default "SIGTERM")
--stop-timeout int Timeout (in seconds) to stop a
container
--storage-opt list Storage driver options for the
container
--sysctl map Sysctl options (default map[])
--tmpfs list Mount a tmpfs directory
--ulimit ulimit Ulimit options (default [])
--userns string User namespace to use
--uts string UTS namespace to use
--volume-driver string Optional volume driver for the
container
