https://github.com/owenrumney/local_k8s

Create a local K8s environment with ansible and ubuntu cloud img
https://github.com/owenrumney/local_k8s

ansible kubernetes learning

Last synced: 22 days ago
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Create a local K8s environment with ansible and ubuntu cloud img

• Host: GitHub
• URL: https://github.com/owenrumney/local_k8s
• Owner: owenrumney
• Created: 2021-06-21T15:50:32.000Z (over 3 years ago)
• Default Branch: master
• Last Pushed: 2022-07-29T09:03:15.000Z (over 2 years ago)
• Last Synced: 2024-10-05T22:21:14.161Z (about 1 month ago)
• Topics: ansible, kubernetes, learning
• Language: Jinja
• Homepage:
• Size: 29.3 KB
• Stars: 4
• Watchers: 2
• Forks: 2
• Open Issues: 0
• Metadata Files:
  • Readme: README.md

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README

        
# Notes

## Assumptions

The following assumptions have been made

- you have ansible installed

- you have got sshd running and can ssh to the localhost

## Local changes required

The following changes are required in the in `ansible/k8s/group_vars/all.yaml`

- `private_key_path` - the path the the private portion of the ssh keypair

## Bridge network

> I've used netplan for my  bridge, other approaches are available but you'll need to use their own instructions

Create a netplan bridge pointing to the physical interface, this will go into `/etc/netplan/01_kvm_bridge.yaml`

```yaml

network:

    version: 2

    renderer: networkd

    ethernets:

        enp39s0:

            dhcp4: false

            dhcp6: false

    bridges:

        br0:

            interfaces: [ enp39s0 ] # the interface on your machine

            addresses: [ 192.168.0.100/24 ]

            gateway4: 192.168.0.1

            mtu: 1500

            nameservers:

                addresses: [ 8.8.8.8, 8.8.4.4 ]

            parameters:

                stp: true

                forward-delay: 4

            dhcp4: no

            dhcp6: no

```

Now generate with `sudo netplan generate`

Now apply with `sudo netplan apply`

## Host IP Tables

Some changes to host IP tables to route traffic from guest to internet correctly

```bash

sudo iptables -I FORWARD -i br0 -j ACCEPT

sudo iptables -I FORWARD -o br0 -j ACCEPT

```

### Downloading the image

Run `images/get_focal_image.sh` to download the ubuntu image locally. You'lll need this as the base image of the nodes.

### Running from scratch

Make sure that the vars in `ansible/k8s/group_vars/all.yaml` are correct, paying attention to paths and worker counts.

```bash

cd ansible/k8s

export ANSIBLE_PASSWORD=

ansible-playbook -i inventories/hosts.ini install_from_scratch.yaml

```

### Kubectl

As part of the process, the kube config will be pulled back to your machine and put into the folder `~/.kube/virtconfig//etc/kubernetes/admin.conf` to protect any existing config you have. To use the virt cluster, `export KUBECONFIG `

```bash

export KUBECONFIG=~/.kube/virtconfig/192.168.0.150/etc/kubernetes/admin.conf

```

Now you can use `kubectl` to interact with the cluster

### Accessing the master

The master node can be accessed using now with `ssh k8s@master-1`

### Destroying the cluster

```bash

virsh destroy master-1 && virsh undefine master-1

for i in {1-3}; do virsh destroy worker-$i && virsh undefine worker-$i; done

```