linux apline - ssh服务安装及免密登陆实现

目标机器

安装ssh服务

apk add openssh-server
apk add openssh
 sed -i "s/#PermitRootLogin.*/PermitRootLogin yes/g" /etc/ssh/sshd_config && \
 sed -i "s/#Port.*/Port 22/g" /etc/ssh/sshd_config && \
 ssh-keygen -t dsa -P "" -f /etc/ssh/ssh_host_dsa_key && \
ssh-keygen -t rsa -P "" -f /etc/ssh/ssh_host_rsa_key && \
ssh-keygen -t ecdsa -P "" -f /etc/ssh/ssh_host_ecdsa_key && \
ssh-keygen -t ed25519 -P "" -f /etc/ssh/ssh_host_ed25519_key && \
echo "root:****" | chpasswd. # 修改密码
/usr/sbin/sshd -D 

自身机器

免密登陆2种方式
方式1 
/ # ssh-copy-id -i /root/.ssh/id_rsa.pub 192.168.1.13
/usr/bin/ssh-copy-id: INFO: Source of key(s) to be installed: "/root/.ssh/id_rsa.pub"
/usr/bin/ssh-copy-id: INFO: attempting to log in with the new key(s), to filter out any that are already installed
expr: warning: '^ERROR: ': using '^' as the first character
of a basic regular expression is not portable; it is ignored
/usr/bin/ssh-copy-id: INFO: 1 key(s) remain to be installed -- if you are prompted now it is to install the new keys
root@192.168.1.13's password: #提示输入密码

Number of key(s) added: 1

Now try logging into the machine, with:   "ssh '192.168.1.13'"
and check to make sure that only the key(s) you wanted were added.

/ # ssh 192.168.1.13
Welcome to Alpine!

The Alpine Wiki contains a large amount of how-to guides and general
information about administrating Alpine systems.
See <http://wiki.alpinelinux.org/>.

You can setup the system with the command: setup-alpine

You may change this message by editing /etc/motd.

方式2: 将公钥文件拷到目标机器
# scp -p ~/.ssh/id_rsa.pub root@192.168.1.13:/root/.ssh/authorized_key
id_rsa.pub                                                                          100%  571   640.3KB/s   00:00

# 测试登录
/ # ssh 192.168.1.13
Welcome to Alpine!

The Alpine Wiki contains a large amount of how-to guides and general
information about administrating Alpine systems.
See <http://wiki.alpinelinux.org/>.

You can setup the system with the command: setup-alpine

You may change this message by editing /etc/motd.