Mir*_*ico 4 ssh permissions kvm lxd
我有一台带有 LXD来宾（基于 ubuntu18.04 映像）的主机（KVM 和 Kubuntu 18.04 ）。
我可以从客人到主机 ssh。
但是尝试从主机到访客 ssh 会导致
权限被拒绝（公钥）
错误
重现步骤：
我做错了什么？
在完整的会话记录下方
sysop@kvmneo4j:~$ lxc list
+----------+---------+-------------------+------+------------+-----------+
| NAME | STATE | IPV4 | IPV6 | TYPE | SNAPSHOTS |
+----------+---------+-------------------+------+------------+-----------+
| base1804 | RUNNING | 10.0.0.205 (eth0) | | PERSISTENT | 0 |
+----------+---------+-------------------+------+------------+-----------+
sysop@kvmneo4j:~$ lxc exec base1804 bash
root@base1804:~# exec login ubuntu
Password:
Last login: Wed Jan 2 18:58:10 UTC 2019 on UNKNOWN
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-43-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
System information as of Wed Jan 2 19:02:28 UTC 2019
System load: 1.69 Processes: 22
Usage of /home: unknown Users logged in: 0
Memory usage: 1% IP address for eth0: 10.0.0.205
Swap usage: 0%
Get cloud support with Ubuntu Advantage Cloud Guest:
http://www.ubuntu.com/business/services/cloud
0 packages can be updated.
0 updates are security updates.
Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings
To run a command as administrator (user "root"), use "sudo <command>".
See "man sudo_root" for details.
ubuntu@base1804:~$ ssh sysop@10.0.0.1
sysop@10.0.0.1's password:
Welcome to Ubuntu 18.04.1 LTS (GNU/Linux 4.15.0-43-generic x86_64)
* Documentation: https://help.ubuntu.com
* Management: https://landscape.canonical.com
* Support: https://ubuntu.com/advantage
* Canonical Livepatch is available for installation.
- Reduce system reboots and improve kernel security. Activate at:
https://ubuntu.com/livepatch
Failed to connect to https://changelogs.ubuntu.com/meta-release-lts. Check your Internet connection or proxy settings
Last login: Wed Jan 2 19:58:42 2019 from 10.0.0.205
sysop@kvmneo4j:~$ logout
Connection to 10.0.0.1 closed.
ubuntu@base1804:~$ logout
sysop@kvmneo4j:~$ ssh -v ubuntu@10.0.0.205
OpenSSH_7.6p1 Ubuntu-4ubuntu0.1, OpenSSL 1.0.2n 7 Dec 2017
debug1: Reading configuration data /etc/ssh/ssh_config
debug1: /etc/ssh/ssh_config line 19: Applying options for *
debug1: Connecting to 10.0.0.205 [10.0.0.205] port 22.
debug1: Connection established.
debug1: identity file /home/sysop/.ssh/id_rsa type 0
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_rsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_dsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_dsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_ecdsa type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_ecdsa-cert type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_ed25519 type -1
debug1: key_load_public: No such file or directory
debug1: identity file /home/sysop/.ssh/id_ed25519-cert type -1
debug1: Local version string SSH-2.0-OpenSSH_7.6p1 Ubuntu-4ubuntu0.1
debug1: Remote protocol version 2.0, remote software version OpenSSH_7.6p1 Ubuntu-4ubuntu0.1
debug1: match: OpenSSH_7.6p1 Ubuntu-4ubuntu0.1 pat OpenSSH* compat 0x04000000
debug1: Authenticating to 10.0.0.205:22 as 'ubuntu'
debug1: SSH2_MSG_KEXINIT sent
debug1: SSH2_MSG_KEXINIT received
debug1: kex: algorithm: curve25519-sha256
debug1: kex: host key algorithm: ecdsa-sha2-nistp256
debug1: kex: server->client cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: kex: client->server cipher: chacha20-poly1305@openssh.com MAC: <implicit> compression: none
debug1: expecting SSH2_MSG_KEX_ECDH_REPLY
debug1: Server host key: ecdsa-sha2-nistp256 SHA256:i0Ezo01qJyhIue4PIRobOw/qKuvDW/7OJZzgB0X5jGM
debug1: Host '10.0.0.205' is known and matches the ECDSA host key.
debug1: Found key in /home/sysop/.ssh/known_hosts:1
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_NEWKEYS sent
debug1: expecting SSH2_MSG_NEWKEYS
debug1: SSH2_MSG_NEWKEYS received
debug1: rekey after 134217728 blocks
debug1: SSH2_MSG_EXT_INFO received
debug1: kex_input_ext_info: server-sig-algs=<ssh-ed25519,ssh-rsa,rsa-sha2-256,rsa-sha2-512,ssh-dss,ecdsa-sha2-nistp256,ecdsa-sha2-nistp384,ecdsa-sha2-nistp521>
debug1: SSH2_MSG_SERVICE_ACCEPT received
debug1: Authentications that can continue: publickey
debug1: Next authentication method: publickey
debug1: Offering public key: RSA SHA256:EfYKpv5N+M8YBgCFjjy3P9M0jYt7DObq9ApoZ0G8qL4 /home/sysop/.ssh/id_rsa
debug1: Authentications that can continue: publickey
debug1: Trying private key: /home/sysop/.ssh/id_dsa
debug1: Trying private key: /home/sysop/.ssh/id_ecdsa
debug1: Trying private key: /home/sysop/.ssh/id_ed25519
debug1: No more authentication methods to try.
ubuntu@10.0.0.205: Permission denied (publickey).
sysop@kvmneo4j:~$
默认情况下，lxd容器的所有 Ubuntu映像都PasswordAuthentication no在其 SSH 配置中设置。
您需要直接进入容器并将配置编辑为root.
(1)lxc shell CONTAINER-NAME会让你进入一个rootshell。
(2)nano /etc/ssh/sshd_config将打开nano文本编辑器到该文件。
(3) 找到该行PasswordAuthentication no并将其设置为yes。
(4) Ctrl+W写入文件，Ctrl+X关闭文件。
(5) 重启SSH服务systemctl restart ssh。（如果这表示您没有权限，sudo请在命令前加上）
您现在应该能够从主机系统通过 SSH 连接到容器。
公钥可用于身份验证。
cat <public_key_file_on_host> | lxc exec <container> -- sh -c "cat >> /home/ubuntu/.ssh/authorized_keys"
lxc exec <container> -- systemctl restart ssh
ssh ubuntu@<container_ip>
笔记：
<public_key_file_on_host>：（~/.ssh/id_rsa.pub或使用 生成一个新的ssh-keygen -t rsa）<container_ip>可以通过以下方式获得lxc listsudo systemd-resolve --interface=lxdbr0 --set-dns=`ip -f inet addr show dev lxdbr0 | grep -Po 'inet \K[\d.]+'` --set-domain=lxdssh ubuntu@<container>.lxd