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# Ansible Role: k3s
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2020-04-08 23:58:20 +02:00
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Ansible role for installing [Rancher Labs k3s](https://k3s.io/) ("Lightweight
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2019-03-10 15:53:52 +01:00
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Kubernetes") as either a standalone server or cluster.
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2019-10-01 22:31:35 +02:00
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[](https://www.travis-ci.org/PyratLabs/ansible-role-k3s)
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2019-03-09 21:54:44 +01:00
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## Requirements
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2020-09-15 19:10:25 +02:00
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The host you're running Ansible from requires the following Python dependencies:
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- `jmespath >= 0.9.0`
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2019-12-21 18:11:30 +01:00
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This role has been tested on Ansible 2.7.0+ against the following Linux Distributions:
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2019-10-26 23:49:48 +02:00
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- Amazon Linux 2
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- CentOS 8
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- CentOS 7
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- Debian 9
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2019-09-29 19:03:50 +02:00
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- Debian 10
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2019-10-26 23:49:48 +02:00
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- Fedora 29
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- Fedora 30
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- Fedora 31
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2020-07-25 18:39:01 +02:00
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- Fedora 32
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2019-09-29 19:03:50 +02:00
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- openSUSE Leap 15
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- Ubuntu 18.04 LTS
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- Ubuntu 20.04 LTS
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2019-03-10 15:53:52 +01:00
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## Disclaimer
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2019-12-04 19:44:37 +01:00
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:warning: May not be suitable for production use!
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2019-12-04 19:44:37 +01:00
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Rancher Labs is awesome and has released k3s as v1.0.0, however at the time of
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creating this role I do not have a k3s cluster in production nor am I unlikely
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to ever have one. Please ensure you practice extreme caution and operational
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rigor before using this role for any serious workloads.
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If you have any problems please create a GitHub issue, I maintain this role in
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my spare time so I cannot promise a speedy fix delivery.
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2019-03-09 21:54:44 +01:00
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## Role Variables
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2019-03-10 15:53:52 +01:00
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### Group Variables
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Below are variables that are set against all of the play hosts for environment
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consistency.
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| Variable | Description | Default Value |
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|------------------------------------------|-------------------------------------------------------------------------------------|--------------------------------------------|
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| `k3s_state` | State of k3s: installed, started, stopped, restarted, downloaded, uninstalled, validated. | installed |
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| `k3s_release_version` | Use a specific version of k3s, eg. `v0.2.0`. Specify `false` for stable. | `false` |
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| `k3s_build_cluster` | When multiple `play_hosts` are available, attempt to cluster. Read notes below. | `true` |
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| `k3s_github_url` | Set the GitHub URL to install k3s from. | https://github.com/rancher/k3s |
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| `k3s_skip_validation` | Skip all tasks that validate configuration. | `false` |
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| `k3s_install_dir` | Installation directory for k3s. | `/usr/local/bin` |
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| `k3s_install_hard_links` | Install using hard links rather than symbolic links. | `false` |
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| `k3s_server_manifests_dir` | Path for place the `k3s_server_manifests_templates`. | `/var/lib/rancher/k3s/server/manifests` |
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| `k3s_server_manifests_templates` | A list of Auto-Deploying Manifests Templates. | [] |
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| `k3s_use_experimental` | Allow the use of experimental features in k3s. | `false` |
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| `k3s_use_unsupported_config` | Allow the use of unsupported configurations in k3s. | `false` |
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| `k3s_non_root` | Install k3s as non-root user. See notes below. | `false` |
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| `k3s_cluster_cidr` | Network CIDR to use for pod IPs | 10.42.0.0/16 |
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| `k3s_service_cidr` | Network CIDR to use for service IPs | 10.43.0.0/16 |
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| `k3s_control_node_address` | Use a specific control node address. IP or FQDN. | _NULL_ |
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| `k3s_control_token` | Use a specific control token, please read notes below. | _NULL_ |
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| `k3s_private_registry` | Private registry configuration file (default: "/etc/rancher/k3s/registries.yaml") | _NULL_ |
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| `k3s_https_port` | HTTPS port listening port. | 6443 |
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| `k3s_use_docker` | Use Docker rather than Containerd? | `false` |
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| `k3s_no_flannel` | Do not use Flannel | `false` |
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| `k3s_flannel_backend` | Flannel backend ('none', 'vxlan', 'ipsec', 'host-gw' or 'wireguard') | vxlan |
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| `k3s_no_coredns` | Do not use CoreDNS | `false` |
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| `k3s_cluster_dns` | Cluster IP for CoreDNS service. Should be in your service-cidr range. | _NULL_ |
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| `k3s_cluster_domain` | Cluster Domain. | cluster.local |
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| `k3s_resolv_conf` | Kubelet resolv.conf file | _NULL_ |
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| `k3s_no_traefik` | Do not use Traefik | `false` |
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| `k3s_no_servicelb` | Do not use ServiceLB, necessary for using something like MetalLB. | `false` |
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| `k3s_no_local_storage` | Do not use Local Storage | `false` |
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| `k3s_default_local_storage_path` | Set Local Storage Path. Specify `false` for default. | `false` |
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| `k3s_no_metrics_server` | Do not deploy metrics server | `false` |
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| `k3s_kube_apiserver_args` | Customized flag for kube-apiserver process | [] |
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| `k3s_kube_scheduler_args` | Customized flag for kube-scheduler process | [] |
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| `k3s_kube_controller_manager_args` | Customized flag for kube-controller-manager process | [] |
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| `k3s_kube_cloud_controller_manager_args` | Customized flag for kube-cloud-controller-manager process | [] |
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| `k3s_disable_scheduler` | Disable Kubernetes default scheduler | `false` |
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| `k3s_disable_cloud_controller` | Disable k3s default cloud controller manager. | `false` |
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| `k3s_disable_network_policy` | Disable k3s default network policy controller. | `false` |
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| `k3s_disable_kube_proxy` | Disable k3s default kube proxy. | `false` |
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| `k3s_write_kubeconfig_mode` | Define the file mode from the generated KubeConfig, eg. `644` | _NULL_ |
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| `k3s_datastore_endpoint` | Define the database or etcd cluster endpoint for HA. | _NULL_ |
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| `k3s_datastore_cafile` | Define the database TLS CA file. | _NULL_ |
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| `k3s_datastore_certfile` | Define the database TLS Cert file. | _NULL_ |
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| `k3s_datastore_keyfile` | Define the database TLS Key file. | _NULL_ |
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| `k3s_become_for_all` | Enable become for all (where value for `k3s_become_for_*` is _NULL_ | `false` |
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| `k3s_become_for_systemd` | Enable become for systemd commands. | _NULL_ |
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| `k3s_become_for_install_dir` | Enable become for writing to `k3s_install_dir`. | _NULL_ |
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| `k3s_become_for_usr_local_bin` | Enable become for writing to `/usr/local/bin/`. | _NULL_ |
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| `k3s_become_for_package_install` | Enable become for installing prerequisite packages. | _NULL_ |
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| `k3s_become_for_kubectl` | Enable become for kubectl commands. | _NULL_ |
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| `k3s_become_for_uninstall` | Enable become for running uninstall scripts. | _NULL_ |
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| `k3s_etcd_datastore` | Use Embedded Etcd as the database backend for HA. (EXPERIMENTAL) | `false` |
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| `k3s_etcd_disable_snapshots` | Disable Etcd snapshots. | `false` |
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| `k3s_etcd_snapshot_schedule_cron` | Etcd snapshot cron schedule. | "`* */12 * * *`" |
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| `k3s_etcd_snapshot_retention` | Etcd snapshot retention. | 5 |
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| `k3s_etcd_snapshot_directory` | Etcd snapshot directory. | `/var/lib/rancher/k3s/server/db/snapshots` |
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| `k3s_secrets_encryption` | Use secrets encryption at rest. (EXPERIMENTAL) | `false` |
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| `k3s_debug` | Enable debug logging on the k3s service | `false` |
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| `k3s_enable_selinux` | Enable SELinux in containerd. (EXPERIMENTAL) | `false` |
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2019-03-10 15:53:52 +01:00
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#### Important note about `k3s_release_version`
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2020-05-18 21:45:48 +02:00
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If you do not set a `k3s_release_version` the latest version from the stable
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channel of k3s will be installed. If you are developing against a specific
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version of k3s you must ensure this is set in your Ansible configuration, eg:
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```yaml
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k3s_release_version: v1.16.9+k3s1
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```
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It is also possible to install specific K3s "Channels", below are some
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examples for `k3s_release_version`:
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```yaml
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k3s_release_version: false # defaults to 'stable' channel
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k3s_release_version: stable # latest 'stable' release
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k3s_release_version: testing # latest 'testing' release
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k3s_release_version: v1.18 # latest v1.18 release
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k3s_release_version: v1.17-testing # latest v1.17 testing release
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k3s_release_version: v1.19.2-k3s1 # specific release
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# specific commit
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# caution - only used for tesing - must be 40 characters
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k3s_release_version: 48ed47c4a3e420fa71c18b2ec97f13dc0659778b
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```
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2020-07-25 15:03:53 +02:00
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#### Important node about `k3s_install_hard_links`
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If you are using the [system-upgrade-controller](https://github.com/rancher/system-upgrade-controller)
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you will need to use hard links rather than symbolic links as the controller
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will not be able to follow symbolic links. This option has been added however
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is not enabled by default to avoid breaking existing installations.
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To enable the use of hard links, ensure `k3s_install_hard_links` is set
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to `true`.
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```yaml
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k3s_install_hard_links: true
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```
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The result of this can be seen by running the following in `k3s_install_dir`:
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`ls -larthi | grep -E 'k3s|ctr|ctl' | grep -vE ".sh$" | sort`
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Symbolic Links:
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```text
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[root@node1 bin]# ls -larthi | grep -E 'k3s|ctr|ctl' | grep -vE ".sh$" | sort
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3277823 -rwxr-xr-x 1 root root 52M Jul 25 12:50 k3s-v1.18.4+k3s1
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3279565 lrwxrwxrwx 1 root root 31 Jul 25 12:52 k3s -> /usr/local/bin/k3s-v1.18.6+k3s1
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3279644 -rwxr-xr-x 1 root root 51M Jul 25 12:52 k3s-v1.18.6+k3s1
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3280079 lrwxrwxrwx 1 root root 31 Jul 25 12:52 ctr -> /usr/local/bin/k3s-v1.18.6+k3s1
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3280080 lrwxrwxrwx 1 root root 31 Jul 25 12:52 crictl -> /usr/local/bin/k3s-v1.18.6+k3s1
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3280081 lrwxrwxrwx 1 root root 31 Jul 25 12:52 kubectl -> /usr/local/bin/k3s-v1.18.6+k3s1
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```
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Hard Links:
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```text
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[root@node1 bin]# ls -larthi | grep -E 'k3s|ctr|ctl' | grep -vE ".sh$" | sort
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3277823 -rwxr-xr-x 1 root root 52M Jul 25 12:50 k3s-v1.18.4+k3s1
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3279644 -rwxr-xr-x 5 root root 51M Jul 25 12:52 crictl
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3279644 -rwxr-xr-x 5 root root 51M Jul 25 12:52 ctr
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3279644 -rwxr-xr-x 5 root root 51M Jul 25 12:52 k3s
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3279644 -rwxr-xr-x 5 root root 51M Jul 25 12:52 k3s-v1.18.6+k3s1
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3279644 -rwxr-xr-x 5 root root 51M Jul 25 12:52 kubectl
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```
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2020-05-16 21:18:10 +02:00
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#### Important note about `k3s_build_cluster`
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If you set `k3s_build_cluster` to `false`, this role will install each play
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host as a standalone node. An example of when you might be building a large
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number of IoT devices running K3s. Below is a hypothetical situation where we
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are to deploy 25 Rasberry Pi devices, each a standalone system and not
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a cluster of 25 nodes. To do this we'd use a playbook similar to the below:
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```yaml
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- hosts: k3s_nodes # eg. 25 RPi's defined in our inventory.
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vars:
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k3s_build_cluster: false
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roles:
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- xanmanning.k3s
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```
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2019-12-21 18:11:30 +01:00
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#### Important note about `k3s_non_root`
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To install k3s as non root you must not use `become: true`. The intention of
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this variable is to run a single node development environment. At the time
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of release v1.0.1, rootless is still experimental.
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2020-05-30 16:16:20 +02:00
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You must also ensure that you set both `k3s_use_experimental`
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and `k3s_use_unsupported_config` to `true`.
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Additionally `k3s_install_dir` must be writable by your user.
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2019-12-04 18:17:15 +01:00
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#### Important notes about `k3s_control_node_address` and `k3s_control_token`
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If you set this, you are explicitly specifying the control host that agents
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should connect to, the value should be an IP address or FQDN.
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If the control host is not configured by this role, then you need to also
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specify the `k3s_control_token`.
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Please note that this may potentially break setting up agents.
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2019-03-10 15:53:52 +01:00
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### Host Variables
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Below are variables that are set against specific hosts in your inventory.
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2020-09-24 16:16:12 +02:00
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| Variable | Description | Default Value |
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|-----------------------------|----------------------------------------------------------------------------------|------------------------|
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| `k3s_control_node` | Define the host as a control plane node, (True/False). | `false` |
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| `k3s_node_name` | Define the name of this node. | `$(hostname)` |
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| `k3s_node_id` | Define the ID of this node. | _NULL_ |
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| `k3s_flannel_interface` | Define the flannel proxy interface for this node. | _NULL_ |
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| `k3s_bind_address` | Define the bind address for this node. | localhost |
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| `k3s_node_ip_address` | IP Address to advertise for this node. | _NULL_ |
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| `k3s_node_external_address` | External IP Address to advertise for this node. | _NULL_ |
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| `k3s_node_labels` | List of node labels. | _NULL_ |
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| `k3s_kubelet_args` | A list of kubelet args to pass to the server. | [] |
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| `k3s_kube_proxy_args` | A list of kube proxy args to pass to the server. | [] |
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|
|
|
| `k3s_node_taints` | List of node taints. | _NULL_ |
|
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|
|
|
| `k3s_node_data_dir` | Folder to hold state. | `/var/lib/rancher/k3s` |
|
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|
|
|
| `k3s_tls_san` | A list of additional hosnames or IPs as Subject Alternate Name in the TLS cert. | [] |
|
2019-03-10 15:53:52 +01:00
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|
2020-01-11 13:31:23 +01:00
|
|
|
#### Important note about `k3s_control_node` and High Availability (HA)
|
2019-03-10 15:53:52 +01:00
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|
|
2020-01-13 22:32:31 +01:00
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|
|
By default only one host will be defined as a control node by Ansible, If you
|
2020-05-30 16:16:20 +02:00
|
|
|
do not set a host as a control node, this role will automatically delegate
|
2020-01-11 13:31:23 +01:00
|
|
|
the first play host as a control node (master). This is not suitable for use in
|
|
|
|
|
a Production workload.
|
2019-03-10 15:53:52 +01:00
|
|
|
|
2020-01-11 13:31:23 +01:00
|
|
|
If multiple hosts have `k3s_control_node` set to true, you must also set
|
|
|
|
|
`k3s_datastore_endpoint` as the connection string to a MySQL or PostgreSQL
|
2020-09-21 20:38:51 +02:00
|
|
|
database, or external Etcd cluster else the play will fail.
|
2020-01-11 13:31:23 +01:00
|
|
|
|
|
|
|
|
If using TLS, the CA, Certificate and Key need to already be available on
|
|
|
|
|
the play hosts.
|
|
|
|
|
|
|
|
|
|
See: [High Availability with an External DB](https://rancher.com/docs/k3s/latest/en/installation/ha/)
|
|
|
|
|
|
2020-05-30 16:16:20 +02:00
|
|
|
It is also possible, though not supported, to run a single K3s master with a
|
|
|
|
|
`k3s_datastore_endpoint` defined. As this is not a typically supported
|
|
|
|
|
configuration you will need to set `k3s_use_unsupported_config` to `true`.
|
|
|
|
|
|
2020-09-17 22:01:20 +02:00
|
|
|
Since K3s v1.19.1 it is possible to use Etcd as the backend database, and this
|
|
|
|
|
is done by setting `k3s_etcd_datastore` to true. As this is an experimental
|
2020-09-21 20:38:51 +02:00
|
|
|
feature you will also need to set `k3s_use_experimental` to `true`. The best
|
|
|
|
|
practice for Etcd is to define at least 3 members to ensure quorum is
|
|
|
|
|
established. In addition to this, an odd number of members is recommended to
|
|
|
|
|
ensure a majority in the event of a network partition. If you want to use 2
|
|
|
|
|
members or an even number of members, please set `k3s_use_unsupported_config`
|
|
|
|
|
to `true`.
|
2019-03-09 21:54:44 +01:00
|
|
|
|
2019-09-29 19:03:50 +02:00
|
|
|
#### Important note about `k3s_flannel_interface`
|
|
|
|
|
|
|
|
|
|
If you are running k3s on systems with multiple network interfaces, it is
|
|
|
|
|
necessary to have the flannel interface on a network interface that is routable
|
|
|
|
|
to the master node(s).
|
|
|
|
|
|
2020-07-04 14:24:10 +02:00
|
|
|
#### Notes about `_args`, `_labels` and `_taints` variables
|
2020-02-27 03:16:52 +01:00
|
|
|
|
2020-07-04 14:24:10 +02:00
|
|
|
Affected variables:
|
|
|
|
|
|
|
|
|
|
- `k3s_kube_apiserver_args`
|
|
|
|
|
- `k3s_kube_scheduler_args`
|
|
|
|
|
- `k3s_kube_controller_manager_args`
|
|
|
|
|
- `k3s_kube_cloud_controller_manager_args`
|
|
|
|
|
- `k3s_kubelet_args`
|
|
|
|
|
- `k3s_kube_proxy_args`
|
2020-02-27 03:16:52 +01:00
|
|
|
|
2020-07-04 14:24:10 +02:00
|
|
|
These parameters allow for assigning additional args to K3s during runtime.
|
|
|
|
|
For instance, to use the Azure Cloud Controller, assign the below to
|
|
|
|
|
the master node's configuration in your host file.
|
2020-02-27 03:16:52 +01:00
|
|
|
|
|
|
|
|
**YAML**:
|
|
|
|
|
|
|
|
|
|
```yaml
|
|
|
|
|
k3s_kubelet_args:
|
|
|
|
|
- cloud-provider: external
|
|
|
|
|
- provider-id: azure
|
|
|
|
|
```
|
|
|
|
|
|
2020-07-04 14:24:10 +02:00
|
|
|
_Note, when using an external cloud controller as above, ensure that the native
|
|
|
|
|
k3s cloud controller is disabled by setting the_ `k3s_disable_cloud_controller`
|
|
|
|
|
_to_ `true`.
|
2019-10-26 23:49:48 +02:00
|
|
|
|
2020-07-04 14:24:10 +02:00
|
|
|
Ultimately these variables are lists of key-value pairs that will be iterated
|
|
|
|
|
on. The below example will output the following:
|
2019-10-26 23:49:48 +02:00
|
|
|
|
|
|
|
|
**YAML**:
|
|
|
|
|
|
|
|
|
|
```yaml
|
|
|
|
|
k3s_node_labels:
|
|
|
|
|
- foo: bar
|
|
|
|
|
- hello: world
|
|
|
|
|
|
|
|
|
|
k3s_node_taints:
|
|
|
|
|
- key1: value1:NoExecute
|
|
|
|
|
```
|
|
|
|
|
|
2020-07-04 14:24:10 +02:00
|
|
|
**K3S ARGS**:
|
2019-10-26 23:49:48 +02:00
|
|
|
|
|
|
|
|
```text
|
|
|
|
|
--node-label foo=bar \
|
|
|
|
|
--node-label hello=world \
|
|
|
|
|
--node-taint key1=value1:NoExecute
|
|
|
|
|
```
|
|
|
|
|
|
2019-03-09 21:54:44 +01:00
|
|
|
## Dependencies
|
|
|
|
|
|
|
|
|
|
No dependencies on other roles.
|
|
|
|
|
|
2020-01-13 22:32:31 +01:00
|
|
|
## Example Playbooks
|
2019-03-09 21:54:44 +01:00
|
|
|
|
2020-01-13 22:32:31 +01:00
|
|
|
Example playbook, single master node running v0.10.2:
|
2019-03-09 21:54:44 +01:00
|
|
|
|
|
|
|
|
```yaml
|
|
|
|
|
- hosts: k3s_nodes
|
|
|
|
|
roles:
|
2019-10-26 23:49:48 +02:00
|
|
|
- { role: xanmanning.k3s, k3s_release_version: v0.10.2 }
|
2019-03-09 21:54:44 +01:00
|
|
|
```
|
|
|
|
|
|
2020-01-13 22:32:31 +01:00
|
|
|
Example playbook, Highly Available running the latest release:
|
|
|
|
|
|
|
|
|
|
```yaml
|
|
|
|
|
- hosts: k3s_nodes
|
|
|
|
|
vars:
|
|
|
|
|
molecule_is_test: true
|
|
|
|
|
k3s_control_node_address: loadbalancer
|
|
|
|
|
k3s_datastore_endpoint: "postgres://postgres:verybadpass@database:5432/postgres?sslmode=disable"
|
|
|
|
|
pre_tasks:
|
|
|
|
|
- name: Set each node to be a control node
|
|
|
|
|
set_fact:
|
|
|
|
|
k3s_control_node: true
|
|
|
|
|
when: inventory_hostname in ['node2', 'node3']
|
|
|
|
|
roles:
|
|
|
|
|
- role: xanmanning.k3s
|
|
|
|
|
```
|
|
|
|
|
|
2019-03-09 21:54:44 +01:00
|
|
|
## License
|
|
|
|
|
|
2020-02-22 11:51:41 +01:00
|
|
|
[BSD 3-clause](LICENSE.txt)
|
2019-03-09 21:54:44 +01:00
|
|
|
|
|
|
|
|
## Author Information
|
|
|
|
|
|
|
|
|
|
[Xan Manning](https://xanmanning.co.uk/)
|
