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	[install] Update CentOS8
Signed-off-by: Kang Huaishuai <khs1994@khs1994.com>
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		@@ -3,3 +3,27 @@
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当前官方版本的 Docker CE [尚未支持][docker-docker] CentOS8,我们可以使用 Moby 项目维护者 AkihiroSuda 所构建的包,具体请参考 https://github.com/AkihiroSuda/moby-snapshot。
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[docker-docker]:https://download.docker.com/linux/centos/
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## 设置
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由于 CentOS8 防火墙使用了 `nftables`,我们可以使用如下设置使用 `iptables`
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更改 `/etc/firewalld/firewalld.conf`
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```bash
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# FirewallBackend=nftables
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FirewallBackend=iptables
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```
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或者执行如下命令:
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```bash
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$ firewall-cmd --permanent --zone=trusted --add-interface=docker0
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$ firewall-cmd --reload
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```
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## 参考链接
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* https://firewalld.org/2018/07/nftables-backend
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* https://github.com/moby/libnetwork/issues/2496
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@@ -9,7 +9,6 @@
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Docker CE 支持以下版本的 [Ubuntu](https://ubuntu.com/server) 操作系统:
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* Ubuntu Focal 20.04 (LTS)
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* Eoan 19.10
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* Bionic 18.04 (LTS)
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* Xenial 16.04 (LTS)
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