# k8s кластер

## Нужно

1. rke - <https://github.com/rancher/rke/releases>
2. k8s-lens - <https://docs.k8slens.dev>
3. helm - <https://helm.sh/docs/intro/quickstart/>
4. Три машины на ubuntu 22.04 + docker

## Разворачиваем куб

1. `rke up --ignore-docker-version`
2. полученный конфиг импортируем в линзу
3. в настройках подключаем метрики

## Полезные команды

```bash
apt update && apt install -y mc htop zip wget curl git jq net-tools gnupg2 screen open-iscsi
curl https://get.docker.com -o install.sh && sh install.sh
```

## Твики

### is apparently in use by the system; will not make a filesystem here!

* Create the default configuration file /etc/multipath.conf if not existed
* Add the following line to blacklist section devnode "^sd[a-z0-9]+"

```config
blacklist {
    devnode "^sd[a-z0-9]+"
}
```

* Restart multipath service# systemctl restart multipathd.service
* Verify that configuration is applied# multipath -t


### Failed to allocate directory watch: Too many open files

на всех нодах кластера:

```bash
sysctl fs.inotify.max_user_watches=65536
sysctl fs.inotify.max_user_instances=8192
sysctl net.ipv4.tcp_max_syn_backlog=100000
sysctl net.core.somaxconn=100000
sysctl net.ipv4.tcp_wmem='4096 12582912 16777216'
sysctl net.ipv4.tcp_rmem='4096 12582912 16777216'
sysctl net.ipv4.ip_local_port_range='10240 65535'
```