14 KiB
Ansible
Installing Ansible
Kubespray supports multiple ansible versions and ships different requirements.txt files for them.
Depending on your available python version you may be limited in choosing which ansible version to use.
It is recommended to deploy the ansible version used by kubespray into a python virtual environment.
VENVDIR=kubespray-venv
KUBESPRAYDIR=kubespray
python3 -m venv $VENVDIR
source $VENVDIR/bin/activate
cd $KUBESPRAYDIR
pip install -U -r requirements.txt
In case you have a similar message when installing the requirements:
ERROR: Could not find a version that satisfies the requirement ansible==7.6.0 (from -r requirements.txt (line 1)) (from versions: [...], 6.7.0)
ERROR: No matching distribution found for ansible==7.6.0 (from -r requirements.txt (line 1))
It means that the version of Python you are running is not compatible with the version of Ansible that Kubespray supports. If the latest version supported according to pip is 6.7.0 it means you are running Python 3.8 or lower while you need at least Python 3.9 (see the table below).
Ansible Python Compatibility
Based on the table below and the available python version for your ansible host you should choose the appropriate ansible version to use with kubespray.
| Ansible Version | Python Version |
|---|---|
| >= 2.16.4 | 3.10-3.12 |
Customize Ansible vars
Kubespray expects users to use one of the following variables sources for settings and customization:
| Layer | Comment |
|---|---|
| inventory vars | |
| - inventory group_vars | most used |
| - inventory host_vars | host specifc vars overrides, group_vars is usually more practical |
| extra vars (always win precedence) | override with ansible-playbook -e @foo.yml |
[!IMPORTANT] Extra vars are best used to override kubespray internal variables, for instances, roles/vars/. Those vars are usually not expected (by Kubespray developpers) to be modified by end users, and not part of Kubespray interface. Thus they can change, disappear, or break stuff unexpectedly.
Ansible tags
The following tags are defined in playbooks:
| Tag name | Used for |
|---|---|
| annotate | Create kube-router annotation |
| apps | K8s apps definitions |
| asserts | Check tasks for download role |
| aws-ebs-csi-driver | Configuring csi driver: aws-ebs |
| azure-csi-driver | Configuring csi driver: azure |
| bastion | Setup ssh config for bastion |
| bootstrap-os | Anything related to host OS configuration |
| calico | Network plugin Calico |
| calico_rr | Configuring Calico route reflector |
| cephfs-provisioner | Configuring CephFS |
| cert-manager | Configuring certificate manager for K8s |
| cilium | Network plugin Cilium |
| cinder-csi-driver | Configuring csi driver: cinder |
| client | Kubernetes clients role |
| cloud-provider | Cloud-provider related tasks |
| cluster-roles | Configuring cluster wide application (psp ...) |
| cni | CNI plugins for Network Plugins |
| containerd | Configuring containerd engine runtime for hosts |
| container_engine_accelerator | Enable nvidia accelerator for runtimes |
| container-engine | Configuring container engines |
| container-runtimes | Configuring container runtimes |
| control-plane | Configuring K8s control plane node role |
| coredns | Configuring coredns deployment |
| crio | Configuring crio container engine for hosts |
| crun | Configuring crun runtime |
| csi-driver | Configuring csi driver |
| dashboard | Installing and configuring the Kubernetes Dashboard |
| dns | Remove dns entries when resetting |
| docker | Configuring docker engine runtime for hosts |
| download | Fetching container images to a delegate host |
| etcd | Configuring etcd cluster |
| etcd-secrets | Configuring etcd certs/keys |
| etchosts | Configuring /etc/hosts entries for hosts |
| external-cloud-controller | Configure cloud controllers |
| external-openstack | Cloud controller : openstack |
| external-provisioner | Configure external provisioners |
| external-vsphere | Cloud controller : vsphere |
| facts | Gathering facts and misc check results |
| files | Remove files when resetting |
| flannel | Network plugin flannel |
| gce | Cloud-provider GCP |
| gcp-pd-csi-driver | Configuring csi driver: gcp-pd |
| gvisor | Configuring gvisor runtime |
| helm | Installing and configuring Helm |
| ingress-controller | Configure ingress controllers |
| ingress_alb | AWS ALB Ingress Controller |
| init | Windows kubernetes init nodes |
| iptables | Flush and clear iptable when resetting |
| k8s-pre-upgrade | Upgrading K8s cluster |
| kata-containers | Configuring kata-containers runtime |
| krew | Install and manage krew |
| kubeadm | Roles linked to kubeadm tasks |
| kube-apiserver | Configuring static pod kube-apiserver |
| kube-controller-manager | Configuring static pod kube-controller-manager |
| kube-vip | Installing and configuring kube-vip |
| kubectl | Installing kubectl and bash completion |
| kubelet | Configuring kubelet service |
| kube-ovn | Network plugin kube-ovn |
| kube-router | Network plugin kube-router |
| kube-proxy | Configuring static pod kube-proxy |
| localhost | Special steps for the localhost (ansible runner) |
| local-path-provisioner | Configure External provisioner: local-path |
| local-volume-provisioner | Configure External provisioner: local-volume |
| macvlan | Network plugin macvlan |
| master (DEPRECATED) | Deprecated - see control-plane |
| metallb | Installing and configuring metallb |
| metrics_server | Configuring metrics_server |
| netchecker | Installing netchecker K8s app |
| network | Configuring networking plugins for K8s |
| mounts | Umount kubelet dirs when reseting |
| multus | Network plugin multus |
| nginx | Configuring LB for kube-apiserver instances |
| node | Configuring K8s minion (compute) node role |
| nodelocaldns | Configuring nodelocaldns daemonset |
| node-label | Tasks linked to labeling of nodes |
| node-webhook | Tasks linked to webhook (granting access to resources) |
| nvidia_gpu | Enable nvidia accelerator for runtimes |
| oci | Cloud provider: oci |
| persistent_volumes | Configure csi volumes |
| persistent_volumes_aws_ebs_csi | Configuring csi driver: aws-ebs |
| persistent_volumes_cinder_csi | Configuring csi driver: cinder |
| persistent_volumes_gcp_pd_csi | Configuring csi driver: gcp-pd |
| persistent_volumes_openstack | Configuring csi driver: openstack |
| policy-controller | Configuring Calico policy controller |
| post-remove | Tasks running post-remove operation |
| post-upgrade | Tasks running post-upgrade operation |
| pre-remove | Tasks running pre-remove operation |
| pre-upgrade | Tasks running pre-upgrade operation |
| preinstall | Preliminary configuration steps |
| registry | Configuring local docker registry |
| reset | Tasks running doing the node reset |
| resolvconf | Configuring /etc/resolv.conf for hosts/apps |
| rbd-provisioner | Configure External provisioner: rdb |
| services | Remove services (etcd, kubelet etc...) when resetting |
| snapshot | Enabling csi snapshot |
| snapshot-controller | Configuring csi snapshot controller |
| system-packages | Install packages using OS package manager |
| upgrade | Upgrading, f.e. container images/binaries |
| upload | Distributing images/binaries across hosts |
| vsphere-csi-driver | Configuring csi driver: vsphere |
| weave | Network plugin Weave |
| win_nodes | Running windows specific tasks |
| youki | Configuring youki runtime |
Note: Use the bash scripts/gen_tags.sh command to generate a list of all
tags found in the codebase. New tags will be listed with the empty "Used for"
field.
Example commands
Example command to filter and apply only DNS configuration tasks and skip everything else related to host OS configuration and downloading images of containers:
ansible-playbook -i inventory/sample/hosts.ini cluster.yml --tags preinstall,facts --skip-tags=download,bootstrap-os
And this play only removes the K8s cluster DNS resolver IP from hosts' /etc/resolv.conf files:
ansible-playbook -i inventory/sample/hosts.ini -e dns_mode='none' cluster.yml --tags resolvconf
And this prepares all container images locally (at the ansible runner node) without installing or upgrading related stuff or trying to upload container to K8s cluster nodes:
ansible-playbook -i inventory/sample/hosts.ini cluster.yml \
-e download_run_once=true -e download_localhost=true \
--tags download --skip-tags upload,upgrade
Note: use --tags and --skip-tags wise and only if you're 100% sure what you're doing.
Bastion host
If you prefer to not make your nodes publicly accessible (nodes with private IPs only), you can use a so-called bastion host to connect to your nodes. To specify and use a bastion, simply add a line to your inventory, where you have to replace x.x.x.x with the public IP of the bastion host.
[bastion]
bastion ansible_host=x.x.x.x
For more information about Ansible and bastion hosts, read Running Ansible Through an SSH Bastion Host
Mitogen
Mitogen support is deprecated, please see mitogen related docs for usage and reasons for deprecation.
Beyond ansible 2.9
Ansible project has decided, in order to ease their maintenance burden, to split between two projects which are now joined under the Ansible umbrella.
Ansible-base (2.10.x branch) will contain just the ansible language implementation while ansible modules that were previously bundled into a single repository will be part of the ansible 3.x package. Please see this blog post that explains in detail the need and the evolution plan.
Note: this change means that ansible virtual envs cannot be upgraded with pip install -U.
You first need to uninstall your old ansible (pre 2.10) version and install the new one.
pip uninstall ansible ansible-base ansible-core
cd kubespray/
pip install -U .