104 lines
2.6 KiB
Markdown
104 lines
2.6 KiB
Markdown
# Bootstrap
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The following lines document how to initalize a fresh cluster. On a real cluster, or using Vagrant. It therefore assumes to clone kubespray to this folder. It will be excluded in *.gitignore* and all files are in this folder.
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Use [kubespray tag](https://github.com/kubernetes-sigs/kubespray/releases) as parameter
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```sh
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./init.sh "release-2.14"
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```
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See [kubespray.io](https://kubespray.io/) oj detailed information about kubespray. Though it seems to be a littlebit outdated.
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## Vagrant
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```sh
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cd kubespray
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vagrant up
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# up and abkle to ssh
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vagrant ssh k8s-1
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```
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## Prod
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Prepare server:
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* deactivate swap!
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* `moritz username ALL=(ALL) NOPASSWD:ALL`
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* `
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```sh
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ssh centos@<ip>
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# auth via pw
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sudo su - root
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adduser moritz
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visudo # add as sudo user
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su - moritz
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sudo yum -y install vim python3
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ssh-keygen
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vim .ssh/authorized_users # paste key
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chmod 644 .ssh/authorized_keys
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# check whether login works with ssh key
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sudo vim /etc/ssh/sshd_config # remove pw auth & root login
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sudo yum upgrade -y && sudo reboot
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```
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Install Kubernetes:
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```sh
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. ./init.sh
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# follow instructions from output, sth like:
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cd kubespray
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ansible-playbook -i inventory/prod/inventory.ini cluster.yml
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```
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And get credentials:
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```sh
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ssh <ip>
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sudo su - root
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cd
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cp -r .kube /home/moritz/
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chown -R moritz. /home/moritz/.kube
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#ctrl + d
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kubectl get ns # test connection
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#ctrl + d
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scp haumdaucher.de:/home/moritz/.kube/config .kube/config
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```
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Foreward in k8s-directory.
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## Upgrade cluster
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Check the current default value of `kube_version` in cloned repository.
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```sh
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cd kubespray
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ansible-playbook -i inventory/prod/inventory.ini -e kube_version=v1.18.8 -e upgrade_cluster_setup=true cluster.yml
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# or just the newest version
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ansible-playbook -i inventory/prod/inventory.ini -e upgrade_cluster_setup=true cluster.yml
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# upgrade to specific calico version (did not trigger/ failed)
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ansible-playbook -i inventory/prod/inventory.ini -e upgrade_cluster_setup=true -e calico_version=v3.15.2 cluster.yml --tags=network
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```
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History:
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* 2020-04-18 kube_version=v1.16.8 kubespray_branch=release-2.12
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## Add node
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See [documentation](https://github.com/kubernetes-sigs/kubespray/blob/master/docs/nodes.md).
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Note: This was more or less a trial and error approach. Running different playbooks over and over again got it right at some point.
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```sh
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ansible-playbook -i inventory/prod/inventory.ini --limit=ns3088070.ip-37-59-40.eu,ns3100058.ip-37-59-61.eu scale.yml
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ansible-playbook -i inventory/prod/inventory.ini --limit=etcd,kube-master -e ignore_assert_errors=yes cluster.yml
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```
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This runs everything and is kind of idempotent:
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```sh
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ansible-playbook -i inventory/prod/inventory.ini cluster.yml
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```
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