centos ssh: connect to host localhost port 22: Connection refused

这个错误通常发生在SSH服务没有启动或者没有正确配置的情况下尝试连接到本地主机的时候。你可以通过检查SSH服务是否已启动，以及防火墙是否阻止了SSH连接，来解决这个问题。具体步骤取决于你的操作系统和网络环境，请参考相关的操作指南来解决问题。如果你需要更具体的帮助，请提供更多的细节和上下文信息，我会尽力帮助你解决问题。

相关问题

ssh: connect to host localhost port 22: Connection refused

This error message typically indicates that the SSH service is not running on the local system or that the port is blocked by a firewall. Here are some possible solutions:

1. Check if the SSH service is running on your system. You can do this by running the command "sudo service ssh status" on Ubuntu or "systemctl status sshd.service" on CentOS. If the service is not running, start it with "sudo service ssh start" or "systemctl start sshd.service".

2. Check if the SSH port (port 22) is blocked by a firewall. You can check this by running the command "sudo ufw status" on Ubuntu or "firewall-cmd --list-all" on CentOS. If the port is blocked, you can open it with "sudo ufw allow 22" or "firewall-cmd --add-port=22/tcp --permanent" (followed by "firewall-cmd --reload" to apply the changes).

3. If you're trying to connect to SSH from a remote system, make sure that the SSH server is configured to allow remote connections. You can check this by editing the SSH configuration file (/etc/ssh/sshd_config) and verifying that the "ListenAddress" and "Port" directives are set correctly.

4. If none of the above solutions work, try restarting both the SSH service and the system itself. Sometimes a simple restart can resolve connection issues.

/usr/bin/ssh-copy-id: ERROR: ssh: connect to host master port 22: Connection refused

这个错误通常是因为目标主机的 SSH 服务未启动或者被防火墙阻止了连接。请确保目标主机上的 SSH 服务已经正确安装并且正在运行，并且目标主机的防火墙允许连接到 SSH 端口（默认是 22）。您可以尝试以下几个解决方案：

1. 确保 SSH 服务正在运行：在目标主机上执行命令 `sudo service ssh status`（对于 Ubuntu 系统）或者 `sudo systemctl status sshd`（对于 CentOS/RHEL 系统），确保 SSH 服务处于运行状态。

2. 检查 SSH 服务端口：确保目标主机的防火墙允许连接到 SSH 端口。默认情况下，SSH 使用的端口是 22。您可以使用命令 `sudo ufw allow 22`（对于 Ubuntu 系统）或者 `sudo firewall-cmd --zone=public --add-port=22/tcp --permanent`（对于 CentOS/RHEL 系统）来允许连接到 SSH 端口。

3. 检查网络连接：确保目标主机和您的计算机之间的网络连接正常。您可以尝试使用 `ping` 命令来测试目标主机是否可达。

如果上述解决方案均未能解决问题，请提供更多关于您的环境、操作系统和网络配置的详细信息，以便我更好地帮助您解决问题。