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OpenStack允许root用户使用ssh-key登录 - 夜雨秋灯录
source link: https://privaterookie.github.io/posts/2019-07-03-OpenStack%E5%85%81%E8%AE%B8root%E7%94%A8%E6%88%B7%E4%BD%BF%E7%94%A8ssh-key%E7%99%BB%E5%BD%95.html
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OpenStack允许 root 用户使用 ssh key 登录
参考: Enable Root Login Over SSH With Cloud-Init on OpenStack
默认情况下如果在创建虚拟机时将 ssh 密钥注入后尝试使用 root 用户登录会提示：
Please login as the user "centos" rather than the user "root".
此时需要移除 /root/.ssh/authorized_keys 第一行的如下内容：
no-port-forwarding,no-agent-forwarding,no-X11-forwarding,command="echo 'Please login as the user \"centos\" rather than the user \"root\".';echo;sleep 10"
并检查 /etc/ssh/sshd_config 中的 PermitRootLogin 配置项，确保其设置如下：
PermitRootLogin without-password
随后重启 sshd 服务。
如果不想在每次创建成功后手动修改，需要修改镜像中的 cloud-init 配置项，
修改 /etc/cloud/cloud.cfg 如下配置项：
disable_root: false
# 或者
disable_root: 0
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