Mac 启动 sshd 失败,以及免密登录 localhost
在 Mac 中启动 Hadoop的时候客户端无法连接,报错:
localhost: ssh: connect to host localhost port 22: Connection refused
启动 sshd报错:
$ /usr/sbin/sshd Could not load host key: /etc/ssh/ssh_host_rsa_key Could not load host key: /etc/ssh/ssh_host_dsa_key Could not load host key: /etc/ssh/ssh_host_ecdsa_key Could not load host key: /etc/ssh/ssh_host_ed25519_key Disabling protocol version 2. Could not load host key sshd: no hostkeys available -- exiting.
目录/etc/ssh/中缺少以上文件,分别生成以上四个文件:
$sudo ssh-keygen -t dsa -f /etc/ssh/ssh_host_dsa_key
启动 sshd 依然报错,修改文件权限:
$sudo chmod 600 ssh_host_dsa_key
sshd启动成功!
$ssh localhost
提示需要密码,这样 Hadoop 还是不能用的,提示没有权限。
执行:
$ssh-keygen
一路enter 键,在~/ssh/下生成文件:id_rsa、id_rsa.pub
用公钥生成验证文件:
cat id_rsa.pub>>~/.ssh/authorized_keysv
重启终端
$ssh localhost
成功免密进入!