Note: This guide requires Docker version 17.09.0 or greater. Refer to the Docker documentation for how to install it.
This guide will help you quickly get started running Docker containers using gVisor.
First, follow the Installation guide.
If you use the apt repository or the automated install, then you can skip
the next section and proceed straight to running a container.
First you will need to configure Docker to use runsc by adding a runtime entry
to your Docker configuration (e.g. /etc/docker/daemon.json). The easiest way
to this is via the runsc install command. This will install a docker runtime
named “runsc” by default.
sudo runsc install
You must restart the Docker daemon after installing the runtime. Typically this
is done via systemd:
sudo systemctl restart docker
Now run your container using the runsc runtime:
docker run --runtime=runsc --rm hello-world
You can also run a terminal to explore the container.
docker run --runtime=runsc --rm -it ubuntu /bin/bash
Many docker options are compatible with gVisor, try them out. Here is an example:
docker run --runtime=runsc --rm --link backend:database -v ~/bin:/tools:ro -p 8080:80 --cpus=0.5 -it busybox telnet towel.blinkenlights.nl
You can verify that you are running in gVisor using the dmesg command.
$ docker run --runtime=runsc -it ubuntu dmesg
[ 0.000000] Starting gVisor...
[ 0.354495] Daemonizing children...
[ 0.564053] Constructing home...
[ 0.976710] Preparing for the zombie uprising...
[ 1.299083] Creating process schedule...
[ 1.479987] Committing treasure map to memory...
[ 1.704109] Searching for socket adapter...
[ 1.748935] Generating random numbers by fair dice roll...
[ 2.059747] Digging up root...
[ 2.259327] Checking naughty and nice process list...
[ 2.610538] Rewriting operating system in Javascript...
[ 2.613217] Ready!
Note that this is easily replicated by an attacker so applications should never
use dmesg to verify the runtime in a security sensitive context.
You may also wish to install a runtime entry with different options. The runsc
install command can accept flags that will be passed to the runtime when it is
invoked by Docker. For example, to install a runtime with debugging enabled, run
the following:
sudo runsc install --runtime runsc-debug -- \
--debug \
--debug-log=/tmp/runsc-debug.log \
--strace \
--log-packets
Note: Ensure that
SELinux(Security Enhanced Linux) is disabled on your system before running the runtime environment with debugging enabled.
Next, look at the different options available for gVisor: platform, network, filesystem.