forked from LaconicNetwork/kompose
205 lines
8.1 KiB
Markdown
205 lines
8.1 KiB
Markdown
# User Guide
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- [Usage](#user-guide)
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* [Kompose convert](#kompose-convert)
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* [Kompose up](#kompose-up)
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* [Kompose down](#kompose-down)
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- [Alternate formats](#alternate-formats)
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- [Unsupported docker-compose configuration options](#unsupported-docker-compose-configuration-options)
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## Kompose convert
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Currently Kompose supports to transform either Docker Compose file (both of v1 and v2) and [experimental Distributed Application Bundles](https://blog.docker.com/2016/06/docker-app-bundle/) into Kubernetes objects. There is a couple of sample files in the `examples/` directory for testing. You will convert the compose or dab file to K8s objects with `kompose convert`.
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```console
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$ cd examples/
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$ ls
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docker-compose.yml docker-compose-bundle.dab docker-gitlab.yml docker-voting.yml
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$ kompose -f docker-gitlab.yml convert -y
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file "redisio-svc.yaml" created
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file "gitlab-svc.yaml" created
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file "postgresql-svc.yaml" created
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file "gitlab-deployment.yaml" created
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file "postgresql-deployment.yaml" created
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file "redisio-deployment.yaml" created
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$ ls *.yaml
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gitlab-deployment.yaml postgresql-deployment.yaml redis-deployment.yaml redisio-svc.yaml web-deployment.yaml
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gitlab-svc.yaml postgresql-svc.yaml redisio-deployment.yaml redis-svc.yaml web-svc.yaml
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```
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You can try with a Docker Compose version 2 like this:
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```console
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$ kompose --file docker-voting.yml convert
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WARN[0000]: Unsupported key networks - ignoring
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WARN[0000]: Unsupported key build - ignoring
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file "worker-svc.json" created
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file "db-svc.json" created
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file "redis-svc.json" created
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file "result-svc.json" created
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file "vote-svc.json" created
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file "redis-deployment.json" created
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file "result-deployment.json" created
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file "vote-deployment.json" created
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file "worker-deployment.json" created
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file "db-deployment.json" created
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$ ls
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db-deployment.json docker-compose.yml docker-gitlab.yml redis-deployment.json result-deployment.json vote-deployment.json worker-deployment.json
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db-svc.json docker-compose-bundle.dab docker-voting.yml redis-svc.json result-svc.json vote-svc.json worker-svc.json
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```
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Using `--bundle, --dab` to specify a DAB file as below:
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```console
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$ kompose --bundle docker-compose-bundle.dab convert
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WARN[0000]: Unsupported key networks - ignoring
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file "redis-svc.json" created
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file "web-svc.json" created
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file "web-deployment.json" created
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file "redis-deployment.json" created
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```
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## Kompose up
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Kompose supports a straightforward way to deploy your "composed" application to Kubernetes via `kompose up` like this:
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```console
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$ kompose --file ./examples/docker-guestbook.yml up
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We are going to create Kubernetes deployments and services for your Dockerized application.
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If you need different kind of resources, use the 'kompose convert' and 'kubectl create -f' commands instead.
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INFO[0000] Successfully created service: redis-master
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INFO[0000] Successfully created service: redis-slave
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INFO[0000] Successfully created service: frontend
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INFO[0001] Successfully created deployment: redis-master
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INFO[0001] Successfully created deployment: redis-slave
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INFO[0001] Successfully created deployment: frontend
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Your application has been deployed to Kubernetes. You can run 'kubectl get deployment,svc,pods' for details.
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$ kubectl get deployment,svc,pods
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NAME DESIRED CURRENT UP-TO-DATE AVAILABLE AGE
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frontend 1 1 1 1 4m
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redis-master 1 1 1 1 4m
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redis-slave 1 1 1 1 4m
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NAME CLUSTER-IP EXTERNAL-IP PORT(S) AGE
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frontend 10.0.174.12 <none> 80/TCP 4m
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kubernetes 10.0.0.1 <none> 443/TCP 13d
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redis-master 10.0.202.43 <none> 6379/TCP 4m
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redis-slave 10.0.1.85 <none> 6379/TCP 4m
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NAME READY STATUS RESTARTS AGE
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frontend-2768218532-cs5t5 1/1 Running 0 4m
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redis-master-1432129712-63jn8 1/1 Running 0 4m
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redis-slave-2504961300-nve7b 1/1 Running 0 4m
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```
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Note:
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- You must have a running Kubernetes cluster with a pre-configured kubectl context.
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- Only deployments and services are generated and deployed to Kubernetes. If you need different kind of resources, use the 'kompose convert' and 'kubectl create -f' commands instead.
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## Kompose down
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Once you have deployed "composed" application to Kubernetes, `kompose down` will help you to take the application out by deleting its deployments and services. If you need to remove other resources, use the 'kubectl' command.
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```console
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$ kompose --file docker-guestbook.yml down
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INFO[0000] Successfully deleted service: redis-master
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INFO[0004] Successfully deleted deployment: redis-master
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INFO[0004] Successfully deleted service: redis-slave
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INFO[0008] Successfully deleted deployment: redis-slave
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INFO[0009] Successfully deleted service: frontend
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INFO[0013] Successfully deleted deployment: frontend
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```
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Note:
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- You must have a running Kubernetes cluster with a pre-configured kubectl context.
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## Alternate formats
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The default `kompose` transformation will generate Kubernetes [Deployments](http://kubernetes.io/docs/user-guide/deployments/) and [Services](http://kubernetes.io/docs/user-guide/services/), in json format. You have alternative option to generate yaml with `-y`. Also, you can alternatively generate [Replication Controllers](http://kubernetes.io/docs/user-guide/replication-controller/) objects, [Deamon Sets](http://kubernetes.io/docs/admin/daemons/), or [Helm](https://github.com/helm/helm) charts.
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```console
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$ kompose convert
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file "redis-svc.json" created
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file "web-svc.json" created
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file "redis-deployment.json" created
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file "web-deployment.json" created
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```
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The `*-deployment.json` files contain the Deployment objects.
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```console
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$ kompose convert --rc -y
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file "redis-svc.yaml" created
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file "web-svc.yaml" created
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file "redis-rc.yaml" created
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file "web-rc.yaml" created
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```
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The `*-rc.yaml` files contain the Replication Controller objects. If you want to specify replicas (default is 1), use `--replicas` flag: `$ kompose convert --rc --replicas 3 -y`
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```console
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$ kompose convert --ds -y
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file "redis-svc.yaml" created
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file "web-svc.yaml" created
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file "redis-daemonset.yaml" created
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file "web-daemonset.yaml" created
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```
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The `*-daemonset.yaml` files contain the Daemon Set objects
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If you want to generate a Chart to be used with [Helm](https://github.com/kubernetes/helm) simply do:
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```console
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$ kompose convert -c -y
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file "web-svc.yaml" created
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file "redis-svc.yaml" created
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file "web-deployment.yaml" created
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file "redis-deployment.yaml" created
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chart created in "./docker-compose/"
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$ tree docker-compose/
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docker-compose
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├── Chart.yaml
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├── README.md
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└── templates
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├── redis-deployment.yaml
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├── redis-svc.yaml
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├── web-deployment.yaml
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└── web-svc.yaml
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```
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The chart structure is aimed at providing a skeleton for building your Helm charts.
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## Unsupported docker-compose configuration options
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Currently `kompose` does not support the following Docker Compose options.
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```
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"build", "cap_add", "cap_drop", "cpuset", "cpu_shares", "cpu_quota", "cgroup_parent", "devices", "depends_on", "dns",
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"dns_search", "domainname", "entrypoint", "env_file", "expose", "extends", "external_links", "extra_hosts", "hostname", "ipc",
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"logging", "mac_address", "mem_limit", "memswap_limit", "network_mode", "networks", "pid", "security_opt", "shm_size",
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"stop_signal", "volume_driver", "volumes_from", "uts", "read_only", "stdin_open", "tty", "user", "ulimits", "dockerfile",
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"net", "args"
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```
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For example:
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```console
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$ cat nginx.yml
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nginx:
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image: nginx
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dockerfile: foobar
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build: ./foobar
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cap_add:
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- ALL
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container_name: foobar
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$ kompose -f nginx.yml convert
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WARN[0000] Unsupported key build - ignoring
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WARN[0000] Unsupported key cap_add - ignoring
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WARN[0000] Unsupported key dockerfile - ignoring
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```
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