@@ -11,13 +11,14 @@ Build a production kubernetes HA cluster.
* If any master is down, lvscare will remove the ipvs realserver, when master recover it will add it back.
* Sealos will send package and apply install commands, so we needn't ansible.
# Supported Environment
# ✨ Supported Environment
## Linux Distributions
## Linux Distributions, CPU Architecture
- Debian 9+, x86_64/ arm64
- Ubuntu 16.04， 18.04， 20.04 , x86_64/ arm64
- Centos/RHEL 7.6+, x86_64/ arm64
- 99% systemd manage linux system。 x86_64/ arm64
- 99% systemd manage linux system， x86_64/ arm64
- Kylin arm64
## kubernetes Versions
...
...
@@ -30,214 +31,126 @@ Build a production kubernetes HA cluster.
- 1.21+
- 1.22+
Looking for more supported versions，[sealyun.com](https://www.sealyun.com)。
Looking for more supported versions, [sealyun.com](https://www.sealyun.com).
sealos is currently supported the latest k8s 1.22+
## Requirements and Recommendations
- Minimum resource requirements
- Minimum resource requirements
- 2 vCpu
- 4G RAM
- 40G+ Storage
- OS requirements
- SSH can access to all nodes.
- hostname is uniq ，and satisfied kubernetes requirements。
- hostname is unique, and satisfied kubernetes requirements.
- Time synchronization for all nodes.
- network Iface has a stranger name, change it to (eth.*|en.*|em.*)
- kubernetes1.20+, use containerd for default cri. user should not to install containerd or docker-ce. sealos will do it
- kubernetes1.19-, use docker for default cri. user should not to install docker-ce. sealos will do it for you
- Networking and DNS requirements：
- Make sure the DNS address in /etc/resolv.conf is available. Otherwise, it may cause some issues of DNS in cluster。
- if you use aliyun/huawei cloud to deploy kubernetes 。 default pod cidr is confilct with dns cidr， we recommand you install kubernetes init flag to add `--podcidr` to aviod this problem。
- sealos default to disable firewalld ，It's recommended that you turn off the firewall. if you want to use firewalld , remember to allow kubernetes port traffic。
# Quick Start
## PreInstall
* Install and start docker
* Download [kubernetes offline package](http://store.lameleg.com) copy it to /root.
* Download [latest sealos](https://github.com/fanux/sealos/releases) on release page.
* Support kuberentes 1.14.0+
## Install
Multi master HA:
```
sealos init --master 192.168.0.2 \
--master 192.168.0.3 \
--master 192.168.0.4 \
--node 192.168.0.5 \
--user root \
--passwd your-server-password \
--version v1.14.1 \
--pkg-url /root/kube1.14.1.tar.gz
```
- if network card has a stranger name, change it to (eth.*|en.*|em.*).
- kubernetes1.20+, use containerd for default cri. user should not to install containerd or docker-ce. sealos will do it.
- kubernetes1.19-, use docker for default cri. user should not to install docker-ce. sealos will do it for you.
- Networking and DNS requirements：
- Make sure the DNS address in /etc/resolv.conf is available. Otherwise, it may cause some issues of DNS in cluster.
- if you use aliyun/huawei cloud to deploy kubernetes. default pod cidr is conflict with dns cidr, we recommend you install kubernetes init flag to add `--podcidr` to avoid this problem.
- sealos default to disable firewalld, It's recommended that you turn off the firewall. if you want to use firewalld , remember to allow kubernetes port traffic.
- Kernel requirements:
- When cni components choose cilium, the kernel version must not be lower than 5.4
**kubernetes .0, the version is not recommended for production environment!!!**
## Clean
```
sealos clean
> Just prepare the server and execute the following command on any server
```sh
# download and install sealos, sealos is a binary tool of golang, just download and copy directly to the bin directory, the release page can also be downloaded
- [x] Support ARM version offline package, v1.20 version offline package supports containerd integration, completely abandon docker
- [x] 99 years certificate, support cluster backup and upgrade
- [x] Does not rely on ansible haproxy keepalived, a binary tool, 0 dependencies
-[x] Offline installation, different versions of kubernetes download corresponding to different versions [Resource pack](https://www.sealyun.com/goodsDetail?type=cloud_kernel&name=kubernetes), Offline package contains all binary files configuration files and images
- [x] High-availability local LIB implemented through ipvs, which takes up less resources, is stable and reliable, and is similar to the implementation of kube-proxy
- [x] Almost compatible with all environments that support systemd x86_64 architecture
- [x] Easily add and delete cluster nodes
- [x] Thousands of users use sealos in the online environment, which is stable and reliable
- [x] The resource pack is placed on Alibaba Cloud OSS, so you don’t have to worry about network speed anymore
