[Hadoop][02]Passphraseless SSH

. 检查是否可以无秘钥登录
ssh localhost

. 生成公钥，密钥
ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa

. 添加到信任
cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys

. 更改权限
chmod 0600 ~/.ssh/authorized_keys

. 复制公钥到远程计算机
ssh-copy-id -i ~/.ssh/id_dsa.pub $USER@$HOSTNAME

ssh-keygen -t rsa -P '' -f ~/.ssh/id_rsa

cat ~/.ssh/id_rsa.pub >> ~/.ssh/authorized_keys

chmod 0600 ~/.ssh/authorized_keys

su - hadoop -c "ssh-keygen -t dsa -P '' -f ~/.ssh/id_dsa"

su - hadoop -c "cat ~/.ssh/id_dsa.pub >> ~/.ssh/authorized_keys"

su - hadoop -c "chmod 0600 ~/.ssh/authorized_keys"

# ssh-copy-id -i /home/hadoop/.ssh/id_dsa.pub $USER@$HOSTNAME

# ssh $HOSTNAME

. 格式转换 DSA格式不支持转换为PEM，需要RSA

ssh-keygen -f ~/.ssh/id_rsa.pub -e -m pem >~/.ssh/id_rsa.pub.pem

. 工具使用 SecureCRT

. 生成公钥，密钥

keygen

wizard

keytype

passphrase

keylength

gen

global

. 使用私钥作为登录依据

host

key

. 复制公钥内容到远端计算机的~/.ssh/authorized_keys文件中（远端计算机需要先用密码登录）

mackey

vim

. 第一次登录解密私钥

decrypt

. 使用root权限查看登录日志确认使用publickey登录

tail /var/log/secure

log