$ gcloud compute instances update-container instance-1 \
    --zone us-central1-a         \
    --container-image=gcr.io/google-containers/busybox

POSITIONAL ARGUMENTS

INSTANCE_NAME

Name of the instance to update.

FLAGS

--container-image=CONTAINER_IMAGE

Sets container image in the declaration to the specified value.
Empty string is not allowed.

--container-privileged

Sets permission to run container to the specified value.

--container-restart-policy=POLICY

Sets container restart policy to the specified value. POLICY must be one of: never, on-failure, always.

--container-stdin

Sets configuration whether to keep container STDIN always open to the specified value.

--container-tty

Sets configuration whether to allocate a pseudo-TTY for the container to the specified value.

--zone=ZONE

Zone of the instance to update. If not specified, you may be prompted to select a zone. gcloud will attempt to identify the zone by searching for resources in your project. If the zone cannot be determined, you will then be prompted with all Google Cloud Platform zones.
To avoid prompting when this flag is omitted, you can set the compute/zone property:

$ gcloud config set compute/zone ZONE

A list of zones can be fetched by running:

$ gcloud compute zones list

To unset the property, run:

$ gcloud config unset compute/zone

Alternatively, the zone can be stored in the environment variable CLOUDSDK_COMPUTE_ZONE.

At most one of these may be specified:

--clear-container-args

Removes the list of arguments from container declaration.
Cannot be used in the same command with --container-arg.

--container-arg=CONTAINER_ARG

Completely replaces the list of arguments with the new list. Each argument must have a separate --container-arg flag. Arguments are appended the new list in the order of flags.
Cannot be used in the same command with --clear-container-arg.

At most one of these may be specified:

--clear-container-command

Removes command from container declaration.
Cannot be used in the same command with --container-command.

--container-command=CONTAINER_COMMAND

Sets command in the declaration to the specified value. Empty string is not allowed.
Cannot be used in the same command with --clear-container-command.

--container-env=[KEY=VALUE, ...,...]

Update environment variables KEY with value VALUE passed to container.

---

Sets KEY to the specified value.

---

Adds KEY = VALUE, if KEY is not yet declared.

---

Only the last value of KEY is taken when KEY is repeated more

than once.
Values, declared with --container-env flag override those with the same KEY from file, provided in --container-env-file.

--container-env-file=CONTAINER_ENV_FILE

Update environment variables from a file. Same update rules as for --container-env apply. Values, declared with --container-env flag override those with the same KEY from file.
File with environment variables declarations in format used by docker (almost). This means:

---

Lines are in format KEY=VALUE

---

Values must contain equality signs.

---

Variables without values are not supported (this is different from

docker format).

*

If # is first non-whitespace character in a line the line is ignored

as a comment.

--remove-container-env=[KEY,...]

Removes environment variables KEY from container declaration Does nothing, if a variable is not present.

--container-mount-host-path=[host-path=HOSTPATH,mount-path=MOUNTPATH[,mode=MODE],...]

Mounts a volume by using host-path.

---

Adds a volume, if mount-path is not yet declared.

---

Replaces a volume, if mount-path is declared.

All parameters (host-path, mount-path, mode) are completely replaced.

host-path

Path on host to mount from.

mount-path

Path on container to mount to. Mount paths with spaces and commas (and other special characters) are not supported by this command.

mode

Volume mount mode: rw (read/write) or ro (read-only).
Default: rw.

--container-mount-tmpfs=[mount-path=MOUNTPATH,...]

Mounts empty tmpfs into container at MOUNTPATH.

mount-path

Path on container to mount to. Mount paths with spaces and commas (and other special characters) are not supported by this command.

--remove-container-mounts=[MOUNTPATH[,MOUNTPATH,...],...]

Removes volume mounts (host-path, tmpfs) with mountPath: MOUNTPATH from container declaration.
Does nothing, if a volume mount is not declared.

GCLOUD WIDE FLAGS

EXAMPLES

$ gcloud compute instances update-container instance-1 \
    --container-image=gcr.io/google-containers/busybox         \
    --container-command='echo "Hello world"'

$ gcloud compute instances update-container instance-1 \
    --container-image=gcr.io/google-containers/busybox         \
    --container-privileged

NOTES

$ gcloud alpha compute instances update-container $ gcloud beta compute instances update-container