今天使用Docker的centos的镜像的时候,需要使用SSH进行免密登陆配置,因为我不想再开一台机器,所以直接打算直接使用当前的镜像,但是在ssh localhost的时候碰到这个问题:

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centos7:/var/lib/ambari-server/resources/stacks/HDP/2.6 # ssh localhost
ssh: connect to host localhost port 22: Cannot assign requested address

明显是因为sshd没有启动,首先需要检查一下ssh有没有装,没有的话使用:

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yum install openssh-server
yum install openssh-clients

安装一下,先。在用用ps -ef验证一下sshd有没有启动,由于是docker里面的centos,所以service和systemctl都不好用。

尝试手动运行/usr/sbin/sshd,报如下错误:

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Could not load host key: /etc/ssh/ssh_host_rsa_key
Could not load host key: /etc/ssh/ssh_host_ecdsa_key
Could not load host key: /etc/ssh/ssh_host_ed25519_key
sshd: no hostkeys available -- exiting.

手动执行/usr/sbin/sshd-keygen -A

再执行/usr/sbin/sshd成功。

为了免密码本机跳本机,执行如下命令:

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ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa
cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys
chmod 0600 ~/.ssh/authorized_keys

至此,执行ssh localhost就能成功。

因为我是想在docker里面安装源码编译的ambari,所以解决上面ssh的问题后,又碰到如下问题:

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==========================
Creating target directory...
==========================

Command start time 2021-05-11 12:51:27

Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
SSH command execution finished
host=localhost, exitcode=255
Command end time 2021-05-11 12:51:27

ERROR: Bootstrap of host localhost fails because previous action finished with non-zero exit code (255)
ERROR MESSAGE: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

STDOUT:
Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).

这是因为使用的文件不对,默认使用private key,误用使用成了public key。


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