阿里云不重启添加或修改密钥对

由于早期购买的服务器没有启用密钥导致ecs无法统一使用密钥。在阿里云控制台添加密钥对的时候提示需要重启生效，感觉生产服务器重启很麻烦。不想看过程的可以直接看下面的测试及结论

拿一台测试服务器做测试

添加密钥对重启之前的/etc/ssh/sshd_config和/root/.ssh/authorized_keys

➜  ~ ssh -i /Users/xujiamin/Downloads/pem/ac.pem   root@47.110.124.91
Last login: Fri Jan 17 13:00:29 2020 from 60.191.70.67Welcome to Alibaba Cloud Elastic Compute Service ![root@iZbp1636bkymp3ar79492aZ ~]# cat /etc/ssh/sshd_config  |grep -v '#' |grep -v '^$'
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
AuthorizedKeysFile  .ssh/authorized_keys
ChallengeResponseAuthentication no
GSSAPIAuthentication yes
GSSAPICleanupCredentials no
UsePAM yes
X11Forwarding yes
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
AcceptEnv XMODIFIERS
Subsystem   sftp    /usr/libexec/openssh/sftp-server
UseDNS no
AddressFamily inet
PermitRootLogin yes
SyslogFacility AUTHPRIV
PasswordAuthentication yes[root@iZbp1636bkymp3ar79492aZ ~]# cat /root/.ssh/authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDnpSv2/Ks0f4Db0dBW3mxRno95EYYb7WXhVn1XOSz4pZOOZ3zxnFRrAC6UZsxmdkFliAAREwIKgKSkngf2XQUavGKsY8LQFC/xOChNiq2ZchWwxCVuHAKnhpBxW4rKyiSzNIJtLqXbBWOrTzHNFDk/ZoxVrfIYb+N+u7fT6Q7Y6PHbitBNZYC5ZfZzrc3laYYIEZfvkTtJRBgxm1l24HRca6uWf2axfHgadyVtLRuxG6kQRdvyTderlizNyaRijdxcKiy5w1biS4Igv7WLqRKMYpZJzajgcW9u5eSdJRQ+Z8sPrt3d+mGMp1CKfHGQSTtsN5F1Cv0xSnq8xCkNUdf3 root@panda
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxrpXLpfwFi9N2VFBRHBabGTStYcMGdisO6Y8jKmr/YcpEeJzmXqlkOuNOUGvyeRqDFjFIrgbTHR2xq/wDJFW9+73aZ+Uq38jR8Nsgnklu6ShttJhO0g7fJt2PtBrBeJUDVlDqt16DD5aKgA+Rs8D9DVrWXhk84JyvfM3w0eN0qCRhWzNiMjorRd+zn6R/M2BsZ9qHu1LCJVrs/HXt1qixVvQEQEn+idzzNgiHIDONP6CPnWXASQZ2Y6pdYZOChS/IZuPe5P1Gqd9WVSG0EuI2dMmZlfXdbCOia9eK66YYK4AZlatMARSy+dLqeTax03wzkc4LYUZrxV+5LgdCQszj root@localhost.localdomain
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCZXaZ11cn4Yee1OqNDT+xS03s46PN16DOCKRdSJdWmhoD1qCkfRdxm1gF1TZsWmphK6hlyvHYJEWdidGhvqtdPXHGfEgZm5jMuswkYw1zGOpKxMMtGe4nwLS7GIJwUdCdyMW6HSkwQribPlfcWeHmS0buzeR8LZhMvHzk5oQhZJStbnuZMlDHpn3PQmLSrwSfG/EaQnGDYS7+kC//Ambx7qZ/wW2vpp+WivsgO7isDarF29NxBcKrZglFK5adug6QOCBZ45cVVJCgbXtgN8+TrFL3ghJ3CN2kctfzlLmbbDU52oPOrLnpEDctM5OTwskz6+iLY7q/W1TevItz6mZuN skp-bp1995ou9mbtq1n4teqa
[root@iZbp1636bkymp3ar79492aZ ~]#

添加密钥对重启生效后的同一台服务器

cat /root/.ssh/authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDnpSv2/Ks0f4Db0dBW3mxRno95EYYb7WXhVn1XOSz4pZOOZ3zxnFRrAC6UZsxmdkFliAAREwIKgKSkngf2XQUavGKsY8LQFC/xOChNiq2ZchWwxCVuHAKnhpBxW4rKyiSzNIJtLqXbBWOrTzHNFDk/ZoxVrfIYb+N+u7fT6Q7Y6PHbitBNZYC5ZfZzrc3laYYIEZfvkTtJRBgxm1l24HRca6uWf2axfHgadyVtLRuxG6kQRdvyTderlizNyaRijdxcKiy5w1biS4Igv7WLqRKMYpZJzajgcW9u5eSdJRQ+Z8sPrt3d+mGMp1CKfHGQSTtsN5F1Cv0xSnq8xCkNUdf3 root@panda
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxrpXLpfwFi9N2VFBRHBabGTStYcMGdisO6Y8jKmr/YcpEeJzmXqlkOuNOUGvyeRqDFjFIrgbTHR2xq/wDJFW9+73aZ+Uq38jR8Nsgnklu6ShttJhO0g7fJt2PtBrBeJUDVlDqt16DD5aKgA+Rs8D9DVrWXhk84JyvfM3w0eN0qCRhWzNiMjorRd+zn6R/M2BsZ9qHu1LCJVrs/HXt1qixVvQEQEn+idzzNgiHIDONP6CPnWXASQZ2Y6pdYZOChS/IZuPe5P1Gqd9WVSG0EuI2dMmZlfXdbCOia9eK66YYK4AZlatMARSy+dLqeTax03wzkc4LYUZrxV+5LgdCQszj root@localhost.localdomain
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCZXaZ11cn4Yee1OqNDT+xS03s46PN16DOCKRdSJdWmhoD1qCkfRdxm1gF1TZsWmphK6hlyvHYJEWdidGhvqtdPXHGfEgZm5jMuswkYw1zGOpKxMMtGe4nwLS7GIJwUdCdyMW6HSkwQribPlfcWeHmS0buzeR8LZhMvHzk5oQhZJStbnuZMlDHpn3PQmLSrwSfG/EaQnGDYS7+kC//Ambx7qZ/wW2vpp+WivsgO7isDarF29NxBcKrZglFK5adug6QOCBZ45cVVJCgbXtgN8+TrFL3ghJ3CN2kctfzlLmbbDU52oPOrLnpEDctM5OTwskz6+iLY7q/W1TevItz6mZuN skp-bp1995ou9mbtq1n4teqa
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCSuyYNLsvDsJ7xsriUg5QqNnU0VEXm1/4QHAOhO0r7vF1BbvmU60wLSt3T9fjQj4My7EBuJTaZCZRapFifMcAdzPGal1Lpvux1sA3bzd2WLcEKLvSXynWRC/WPEeGGzVlKPaJKe7UnHBRCAIxh0eCsNNRiq8+rTNRZTame62kk1y85czQexhrH1p0jLpTen0MxLZF6UIE8lXJxaeaa2RnROijmP4jIByontBjJ0A/CyRCyaPf4UVSKn8ILAsWE2twqY0J/glTtytCZcfe1xjVGGaPiXaZJosxw7TRI9cMdOGbvEWo0uGr0oW7zNfM3vc5HxaAKsYO4dK4dxyJBp6AD skp-bp1i5sbfmyi45a9ibohl[root@izbp1636bkymp3ar79492az ~]# cat /etc/ssh/sshd_config  |grep -v '#' |grep -v '^$'
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_ecdsa_key
HostKey /etc/ssh/ssh_host_ed25519_key
AuthorizedKeysFile  .ssh/authorized_keys
ChallengeResponseAuthentication no
GSSAPIAuthentication yes
GSSAPICleanupCredentials no
UsePAM yes
X11Forwarding yes
AcceptEnv LANG LC_CTYPE LC_NUMERIC LC_TIME LC_COLLATE LC_MONETARY LC_MESSAGES
AcceptEnv LC_PAPER LC_NAME LC_ADDRESS LC_TELEPHONE LC_MEASUREMENT
AcceptEnv LC_IDENTIFICATION LC_ALL LANGUAGE
AcceptEnv XMODIFIERS
Subsystem   sftp    /usr/libexec/openssh/sftp-server
UseDNS no
AddressFamily inet
PermitRootLogin yes
SyslogFacility AUTHPRIV
PasswordAuthentication no

使用密钥对登陆

Last login: Fri Jan 17 13:57:49 on ttys003
➜  ~ ssh -i /Users/xujiamin/Downloads/pem/op.pem   root@47.110.124.91
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDnpSv2/Ks0f4Db0dBW3mxRno95EYYb7WXhVn1XOSz4pZOOZ3zxnFRrAC6UZsxmdkFliAAREwIKgKSkngf2XQUavGKsY8LQFC/xOChNiq2ZchWwxCVuHAKnhpBxW4rKyiSzNIJtLqXbBWIT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:K0qJY6EuxrIf6pf0+o2L6T4jNyOCHg6ulfABzAC3Elk.
Please contact your system administrator.
Add correct host key in /Users/xujiamin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/xujiamin/.ssh/known_hosts:88
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.
root@47.110.124.91: Permission denied (publickey,gssapi-keyex,gssapi-with-mic,password).
➜  ~ ssh -i /Users/xujiamin/Downloads/pem/ac.pem   root@47.110.124.91
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:K0qJY6EuxrIf6pf0+o2L6T4jNyOCHg6ulfABzAC3Elk.
Please contact your system administrator.
Add correct host key in /Users/xujiamin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/xujiamin/.ssh/known_hosts:88
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.
Last login: Fri Nov 22 16:28:12 2019 from 192.168.1.187Welcome to Alibaba Cloud Elastic Compute Service ![root@iZbp1636bkymp3ar79492aZ ~]#
[root@iZbp1636bkymp3ar79492aZ ~]#
[root@iZbp1636bkymp3ar79492aZ ~]# cat /root/.ssh/authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDnpSv2/Ks0f4Db0dBW3mxRno95EYYb7WXhVn1XOSz4pZOOZ3zxnFRrAC6UZsxmdkFliAAREwIKgKSkngf2XQUavGKsY8LQFC/xOChNiq2ZchWwxCVuHAKnhpBxW4rKyiSzNIJtLqXbBWOrTzHNFDk/ZoxVrfIYb+N+u7fT6Q7Y6PHbitBNZYC5ZfZzrc3laYYIEZfvkTtJRBgxm1l24HRca6uWf2axfHgadyVtLRuxG6kQRdvyTderlizNyaRijdxcKiy5w1biS4Igv7WLqRKMYpZJzajgcW9u5eSdJRQ+Z8sPrt3d+mGMp1CKfHGQSTtsN5F1Cv0xSnq8xCkNUdf3 root@panda
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxrpXLpfwFi9N2VFBRHBabGTStYcMGdisO6Y8jKmr/YcpEeJzmXqlkOuNOUGvyeRqDFjFIrgbTHR2xq/wDJFW9+73aZ+Uq38jR8Nsgnklu6ShttJhO0g7fJt2PtBrBeJUDVlDqt16DD5aKgA+Rs8D9DVrWXhk84JyvfM3w0eN0qCRhWzNiMjorRd+zn6R/M2BsZ9qHu1LCJVrs/HXt1qixVvQEQEn+idzzNgiHIDONP6CPnWXASQZ2Y6pdYZOChS/IZuPe5P1Gqd9WVSG0EuI2dMmZlfXdbCOia9eK66YYK4AZlatMARSy+dLqeTax03wzkc4LYUZrxV+5LgdCQszj root@localhost.localdomain
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCZXaZ11cn4Yee1OqNDT+xS03s46PN16DOCKRdSJdWmhoD1qCkfRdxm1gF1TZsWmphK6hlyvHYJEWdidGhvqtdPXHGfEgZm5jMuswkYw1zGOpKxMMtGe4nwLS7GIJwUdCdyMW6HSkwQribPlfcWeHmS0buzeR8LZhMvHzk5oQhZJStbnuZMlDHpn3PQmLSrwSfG/EaQnGDYS7+kC//Ambx7qZ/wW2vpp+WivsgO7isDarF29NxBcKrZglFK5adug6QOCBZ45cVVJCgbXtgN8+TrFL3ghJ3CN2kctfzlLmbbDU52oPOrLnpEDctM5OTwskz6+iLY7q/W1TevItz6mZuN skp-bp1995ou9mbtq1n4teqa
[root@iZbp1636bkymp3ar79492aZ ~]# cat /root/.ssh/authorized_keys
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQDnpSv2/Ks0f4Db0dBW3mxRno95EYYb7WXhVn1XOSz4pZOOZ3zxnFRrAC6UZsxmdkFliAAREwIKgKSkngf2XQUavGKsY8LQFC/xOChNiq2ZchWwxCVuHAKnhpBxW4rKyiSzNIJtLqXbBWOrTzHNFDk/ZoxVrfIYb+N+u7fT6Q7Y6PHbitBNZYC5ZfZzrc3laYYIEZfvkTtJRBgxm1l24HRca6uWf2axfHgadyVtLRuxG6kQRdvyTderlizNyaRijdxcKiy5w1biS4Igv7WLqRKMYpZJzajgcW9u5eSdJRQ+Z8sPrt3d+mGMp1CKfHGQSTtsN5F1Cv0xSnq8xCkNUdf3 root@panda
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCxrpXLpfwFi9N2VFBRHBabGTStYcMGdisO6Y8jKmr/YcpEeJzmXqlkOuNOUGvyeRqDFjFIrgbTHR2xq/wDJFW9+73aZ+Uq38jR8Nsgnklu6ShttJhO0g7fJt2PtBrBeJUDVlDqt16DD5aKgA+Rs8D9DVrWXhk84JyvfM3w0eN0qCRhWzNiMjorRd+zn6R/M2BsZ9qHu1LCJVrs/HXt1qixVvQEQEn+idzzNgiHIDONP6CPnWXASQZ2Y6pdYZOChS/IZuPe5P1Gqd9WVSG0EuI2dMmZlfXdbCOia9eK66YYK4AZlatMARSy+dLqeTax03wzkc4LYUZrxV+5LgdCQszj root@localhost.localdomain
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCZXaZ11cn4Yee1OqNDT+xS03s46PN16DOCKRdSJdWmhoD1qCkfRdxm1gF1TZsWmphK6hlyvHYJEWdidGhvqtdPXHGfEgZm5jMuswkYw1zGOpKxMMtGe4nwLS7GIJwUdCdyMW6HSkwQribPlfcWeHmS0buzeR8LZhMvHzk5oQhZJStbnuZMlDHpn3PQmLSrwSfG/EaQnGDYS7+kC//Ambx7qZ/wW2vpp+WivsgO7isDarF29NxBcKrZglFK5adug6QOCBZ45cVVJCgbXtgN8+TrFL3ghJ3CN2kctfzlLmbbDU52oPOrLnpEDctM5OTwskz6+iLY7q/W1TevItz6mZuN skp-bp1995ou9mbtq1n4teqa
ssh-rsa AAAAB3NzaC1yc2EAAAADAQABAAABAQCSuyYNLsvDsJ7xsriUg5QqNnU0VEXm1/4QHAOhO0r7vF1BbvmU60wLSt3T9fjQj4My7EBuJTaZCZRapFifMcAdzPGal1Lpvux1sA3bzd2WLcEKLvSXynWRC/WPEeGGzVlKPaJKe7UnHBRCAIxh0eCsNNRiq8+rTNRZTame62kk1y85czQexhrH1p0jLpTen0MxLZF6UIE8lXJxaeaa2RnROijmP4jIByontBjJ0A/CyRCyaPf4UVSKn8ILAsWE2twqY0J/glTtytCZcfe1xjVGGaPiXaZJosxw7TRI9cMdOGbvEWo0uGr0oW7zNfM3vc5HxaAKsYO4dK4dxyJBp6AD skp-bp1i5sbfmyi45a9ibohl
[root@iZbp1636bkymp3ar79492aZ ~]# 登出
Connection to 47.110.124.91 closed.
➜  ~ ssh -i /Users/xujiamin/Downloads/pem/op.pem   root@47.110.124.91
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
@    WARNING: REMOTE HOST IDENTIFICATION HAS CHANGED!     @
@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@@
IT IS POSSIBLE THAT SOMEONE IS DOING SOMETHING NASTY!
Someone could be eavesdropping on you right now (man-in-the-middle attack)!
It is also possible that a host key has just been changed.
The fingerprint for the ECDSA key sent by the remote host is
SHA256:K0qJY6EuxrIf6pf0+o2L6T4jNyOCHg6ulfABzAC3Elk.
Please contact your system administrator.
Add correct host key in /Users/xujiamin/.ssh/known_hosts to get rid of this message.
Offending ECDSA key in /Users/xujiamin/.ssh/known_hosts:88
Password authentication is disabled to avoid man-in-the-middle attacks.
Keyboard-interactive authentication is disabled to avoid man-in-the-middle attacks.
Last login: Fri Jan 17 13:58:12 2020 from 60.191.70.67Welcome to Alibaba Cloud Elastic Compute Service !

测试及结论

用原来的密码 + ac.pem的镜像初始化出来的机子。通过阿里云控制台添加pd.pem ，手动加入op.pem并重启之后。密钥变化会如何

还是这台机子重新灌镜像

1 手动添加op.pem之后测试镜像包含的ac.pem和刚刚手动添加的op.pem都可以登陆 pd.pem因为还没有重启还不能登陆

2 重启服务器之后发现 ac.pem pd.pem和op.pem都可以登陆，但是密码登陆不行了

需要修改/etc/ssh/sshd_config

PasswordAuthentication yes # 把no改成yes

修改完成之后重启sshd服务

service sshd restart

密码登陆功能开启了。但是密码已经不是原来的密码了。需要使用密钥登陆上去使用passwd 重置一下root密码

估计是关闭了密码的功能导致密码失效了

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第一步:进入阿里云控制台选择实例第二步点击对应实例的右侧的更多第三步:选择进入对应重置实例密码第四步:修改

阿里云不重启修改或添加密钥

阿里云不重启添加或修改密钥对

拿一台测试服务器做测试

添加密钥对重启生效后的同一台服务器

使用密钥对登陆

测试及结论

1 手动添加op.pem之后测试镜像包含的ac.pem和刚刚手动添加的op.pem都可以登陆 pd.pem因为还没有重启还不能登陆

2 重启服务器之后发现 ac.pem pd.pem和op.pem都可以登陆，但是密码登陆不行了

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拿一台测试服务器做测试

添加密钥对 重启生效后的同一台服务器

使用密钥对登陆

测试及结论

1 手动添加op.pem之后测试 镜像包含的ac.pem和刚刚手动添加的op.pem都可以登陆 pd.pem因为还没有重启 还不能登陆

2 重启服务器之后 发现 ac.pem pd.pem和op.pem都可以登陆，但是密码登陆不行了

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添加密钥对重启生效后的同一台服务器

1 手动添加op.pem之后测试镜像包含的ac.pem和刚刚手动添加的op.pem都可以登陆 pd.pem因为还没有重启还不能登陆

2 重启服务器之后发现 ac.pem pd.pem和op.pem都可以登陆，但是密码登陆不行了