Docker 1.7.0 is released (change log) and so time to update Docker Hosts, CLI, and other tools.
Docker 1.7.0
Docker Host is running inside a Docker Machine and so the machine needs to be upgraded. The machine must be stopped otherwise you get an error as:
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Error: machine must be running to upgrade.
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So start the machine as:
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>docker-machine start mymachine
Starting VM...
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And then upgrade the machine as:
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> docker-machine upgrade mymachine
Stopping machine to do the upgrade...
Upgrading machine mymachine...
Downloading https://github.com/boot2docker/boot2docker/releases/download/v1.7.0/boot2docker.iso to /Users/arungupta/.docker/machine/cache/boot2docker.iso...
Starting machine back up...
Starting VM...
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The machine is anyway stopped to perform an upgrade, and so the need to start the machine seems superfluous (#1399).
Upgrading the host updates .docker/machine/cache/boot2docker.iso. Any previously created machines cache the boot2docker.iso in .docker/machine/machines/<MACHINE-NAME> and so they’ll continue to boot using the same version.
Docker CLI
Update the Docker CLI as:
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curl https://get.docker.com/builds/Darwin/x86_64/docker-latest > /usr/local/bin/docker
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Now docker version shows the following output:
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> docker version
Client version: 1.7.0
Client API version: 1.19
Go version (client): go1.4.2
Git commit (client): 0baf609
OS/Arch (client): darwin/amd64
Server version: 1.7.0
Server API version: 1.19
Go version (server): go1.4.2
Git commit (server): 0baf609
OS/Arch (server): linux/amd64
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Note, the client API version (1.7.0) and the server API version (1.7.0) are both shown here.
If you update only the CLI and not the Docker Host, then the following error message is shown:
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Error response from daemon: client and server don't have same version (client : 1.19, server: 1.18)
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This error messages shows a version mismatch between the client CLI and the Docker Host running in the machine. The will typically happen if the active machine was created a few days ago using an older boot2docker.iso. There seems to be no way straight forward way to find out the exact version currently being used (#1398).
There seems to be no way for a new client to talk to the old server (#14077), and thus the host needs to be upgraded. There is a proposal to override the API version of client (#11486), but at this time there is no ETA for the fix. So the only option is to upgrade the docker machine, which will then then upgrade to the latest version of Docker.
So upgrading the CLI requires to upgrade the machine as well.
Here are the options supported by Docker CLI :
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> docker --help
Usage: docker [OPTIONS] COMMAND [arg...]
A self-sufficient runtime for linux containers.
Options:
-D, --debug=false Enable debug mode
-d, --daemon=false Enable daemon mode
-H, --host=[] Daemon socket(s) to connect to
-h, --help=false Print usage
-l, --log-level=info Set the logging level
--tls=false Use TLS; implied by --tlsverify
--tlscacert=~/.docker/machine/machines/microservices/ca.pem Trust certs signed only by this CA
--tlscert=~/.docker/machine/machines/microservices/cert.pem Path to TLS certificate file
--tlskey=~/.docker/machine/machines/microservices/key.pem Path to TLS key file
--tlsverify=true Use TLS and verify the remote
-v, --version=false Print version information and quit
Commands:
attach Attach to a running container
build Build an image from a Dockerfile
commit Create a new image from a container's changes
cp Copy files/folders from a container's filesystem to the host path
create Create a new container
diff Inspect changes on a container's filesystem
events Get real time events from the server
exec Run a command in a running container
export Stream the contents of a container as a tar archive
history Show the history of an image
images List images
import Create a new filesystem image from the contents of a tarball
info Display system-wide information
inspect Return low-level information on a container or image
kill Kill a running container
load Load an image from a tar archive
login Register or log in to a Docker registry server
logout Log out from a Docker registry server
logs Fetch the logs of a container
pause Pause all processes within a container
port Lookup the public-facing port that is NAT-ed to PRIVATE_PORT
ps List containers
pull Pull an image or a repository from a Docker registry server
push Push an image or a repository to a Docker registry server
rename Rename an existing container
restart Restart a running container
rm Remove one or more containers
rmi Remove one or more images
run Run a command in a new container
save Save an image to a tar archive
search Search for an image on the Docker Hub
start Start a stopped container
stats Display a stream of a containers' resource usage statistics
stop Stop a running container
tag Tag an image into a repository
top Lookup the running processes of a container
unpause Unpause a paused container
version Show the Docker version information
wait Block until a container stops, then print its exit code
Run 'docker COMMAND --help' for more information on a command.
machines> docker events --help
Usage: docker events [OPTIONS]
Get real time events from the server
-f, --filter=[] Filter output based on conditions provided
--help=false Print usage
--since= Show all events created since timestamp
--until= Stream events until this timestamp
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Docker Machine 0.3.0
This was rather straight forward:
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curl -L https://github.com/docker/machine/releases/download/v0.3.0/docker-machine_darwin-amd64 > /usr/local/bin/docker-machine
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There are a lots of new features, including an experimental provisioner for Red Hat Enterprise Linux 7.0.
The version is shown as:
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> docker-machine --version
docker-machine version 0.3.0 (0a251fe)
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Complete list of commands are:
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> docker-machine --help
Usage: docker-machine [OPTIONS] COMMAND [arg...]
Create and manage machines running Docker.
Version: 0.3.0 (0a251fe)
Author:
Docker Machine Contributors - <https://github.com/docker/machine>
Options:
--debug, -D Enable debug mode
-s, --storage-path "/Users/arungupta/.docker/machine" Configures storage path [$MACHINE_STORAGE_PATH]
--tls-ca-cert CA to verify remotes against [$MACHINE_TLS_CA_CERT]
--tls-ca-key Private key to generate certificates [$MACHINE_TLS_CA_KEY]
--tls-client-cert Client cert to use for TLS [$MACHINE_TLS_CLIENT_CERT]
--tls-client-key Private key used in client TLS auth [$MACHINE_TLS_CLIENT_KEY]
--native-ssh Use the native (Go-based) SSH implementation. [$MACHINE_NATIVE_SSH]
--help, -h show help
--version, -v print the version
Commands:
active Print which machine is active
config Print the connection config for machine
create Create a machine
env Display the commands to set up the environment for the Docker client
inspect Inspect information about a machine
ip Get the IP address of a machine
kill Kill a machine
ls List machines
regenerate-certs Regenerate TLS Certificates for a machine
restart Restart a machine
rm Remove a machine
ssh Log into or run a command on a machine with SSH.
scp Copy files between machines
start Start a machine
stop Stop a machine
upgrade Upgrade a machine to the latest version of Docker
url Get the URL of a machine
help, h Shows a list of commands or help for one command
Run 'docker-machine COMMAND --help' for more information on a command.
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Docker Compose 1.3.0
Docker Compose can be updated to 1.3.0 as:
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curl -L https://github.com/docker/compose/releases/download/1.3.0/docker-compose-`uname -s`-`uname -m` > /usr/local/bin/docker-compose
chmod +x /usr/local/bin/docker-compose
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The version is shown as:
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> docker-compose --version
docker-compose version: 1.3.0
CPython version: 2.7.9
OpenSSL version: OpenSSL 1.0.1j 15 Oct 2014
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Two important points to note:
- At least Docker 1.6.0 is required
- There are breaking changes from Compose 1.2 and so you either need to remove and recreate your containers, or migrate them.Fortunately
docker-compose migrate-to-labelscan be used to migrate pre-Compose 1.3.0 containers to the latest format. This will recreate the containers with labels added.
Learn more in Docker Compose to Orchestrate Containers.
Docker Swarm 0.3.0
As of this blog, Docker Swarm 0.3.0 RC3 is available. Clustering Using Docker Swarm provide a good introduction to Docker Swarm and can be used to get started with the latest Docker Swarm release.
34 issues have been fixed since 0.2.0 but the commit notifications since 0.2.0 for Release Candidates seem to show no significant changes.
More detailed blogs on each Docker component will be shared in subsequent blogs.
Enjoy!
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Good job. Thank you so much! Finally, it became clearer what kind of technology. It is even a pity that at one time I did not meet such information – it would save time to study the scattered information. You can see here if you need help with the assignment https://homeworkneeded.com/help-with-assignment. Experimenting a bit with the docker – an interesting thing. Of the problems encountered, it is quite difficult to make zero-downtime restarts and deployments. You can also note the Docker alternative – Rocket, which is developing in the framework of CoreOS.