init

1.k8s/README.md

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+# 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'
+```