centos7.3和centos7.6升级完毕测试登录ssh以及重启后登录ssh均无问题。
前期请自行配置好yum源（如果不会请百度）
整个过程不需要卸载原先的openssl包和openssh的rpm包。不影响我们的操作
本文的环境都是系统自带的openssh，没有经历过手动编译安装方式。如果之前有手动编译安装过openssh，请参照本文自行测试是否能成功。
如果严格参照本文操作，我保证你升级没问题
centos7.6升级后的效果
[root@testssh ~]# ssh -V
OpenSSH_8.0p1, OpenSSL 1.0.2r 26 Feb 2019
[root@testssh ~]# openssl version
OpenSSL 1.0.2r 26 Feb 2019
[root@testssh ~]# cat /etc/redhat-release
CentOS Linux release 7.6.1810 (Core)
[root@testssh ~]#centos7.3升级后的效果
[root@linux-node3 ~]# openssl version
OpenSSL 1.0.2r 26 Feb 2019
[root@linux-node3 ~]# ssh -V
OpenSSH_8.0p1, OpenSSL 1.0.2r 26 Feb 2019
[root@linux-node3 ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@linux-node3 ~]#如果ssh版本过低，最好先yum update openssh升级下到目前yum仓库默认的openssh7.4p1版本
默认centos7.3的ssh是如下版本
[root@linux-node3 ~]# cat /etc/redhat-release
CentOS Linux release 7.3.1611 (Core)
[root@linux-node3 ~]# ssh -V
OpenSSH_6.6.1p1, OpenSSL 1.0.1e-fips 11 Feb 2013
[root@linux-node3 ~]#执行yum update openssh先升级下（反正官方提供的这种升级是没问题的。如果之前手动编译操作过openssh的升级，变更了默认配置文件路径什么的请自行测试。）
（这里准备统一openssh版本为7.4p1之后再统一编译安装升级到openssh8.0p1）
[root@linux-node3 ~]# yum update openssh -y
[root@linux-node3 ~]# ssh -V
OpenSSH_7.4p1, OpenSSL 1.0.2k-fips 26 Jan 2017
[root@linux-node3 ~]#安装telnet-server以及xinetd
[root@linux-node3 ~]# yum install xinetd telnet-server -y
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* epel: mirrors.aliyun.com
* extras: mirrors.cn99.com
* updates: mirrors.cn99.com
Package 2:xinetd-2.3.15-13.el7.x86_64 already installed and latest version
Package 1:telnet-server-0.17-64.el7.x86_64 already installed and latest version
Nothing to do
[root@linux-node3 ~]#配置telnet
现在很多centos7版本安装telnet-server以及xinetd之后没有一个叫telnet的配置文件了。
如果下面telnet文件不存在的话，可以跳过这部分的更改
[root@linux-node3 ~]# ll /etc/xinetd.d/telnet
ls: cannot access /etc/xinetd.d/telnet: No such file or directory如果下面文件存在，请更改配置telnet可以root登录，把disable = no改成disable = yes
[root@rhel yum.repos.d]# cat /etc/xinetd.d/telnet
# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
disable = no
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}
[root@rhel yum.repos.d]# vim /etc/xinetd.d/telnet
[root@rhel yum.repos.d]# cat /etc/xinetd.d/telnet
# default: on
# description: The telnet server serves telnet sessions; it uses \
# unencrypted username/password pairs for authentication.
service telnet
{
disable = yes
flags = REUSE
socket_type = stream
wait = no
user = root
server = /usr/sbin/in.telnetd
log_on_failure += USERID
}配置telnet登录的终端类型，在/etc/securetty文件末尾增加一些pts终端，如下
pts/0
pts/1
pts/2
pts/3配置之后的显示
[root@linux-node3 ~]# vim /etc/securetty
[root@linux-node3 ~]# tail -5 /etc/securetty
xvc0
pts/0
pts/1
pts/2
pts/3
[root@linux-node3 ~]#启动telnet服务，并设置开机自动启动
[root@linux-node3 ~]# systemctl enable xinetd
[root@linux-node3 ~]# systemctl enable telnet.socket
Created symlink from /etc/systemd/system/sockets.target.wants/telnet.socket to /usr/lib/systemd/system/telnet.socket.
[root@linux-node3 ~]#
[root@linux-node3 ~]# systemctl start telnet.socket
[root@linux-node3 ~]# systemctl start xinetd
[root@linux-node3 ~]# netstat -lntp|grep 23
tcp6 0 0 :::23 :::* LISTEN 1/systemd
[root@linux-node3 ~]#切换到telnet方式登录，以后的操作都在telnet终端下操作，防止ssh连接意外中断造成升级失败
telnet方式登录
安装依赖包
升级需要几个组件，有些是和编译相关的等
[root@linux-node3 ~]# yum install -y gcc gcc-c++ glibc make autoconf openssl openssl-devel pcre-devel pam-devel
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* epel: mirrors.aliyun.com
* extras: mirrors.cn99.com
* updates: mirrors.cn99.com
Package gcc-4.8.5-36.el7_6.1.x86_64 already installed and latest version
Package gcc-c++-4.8.5-36.el7_6.1.x86_64 already installed and latest version
Package glibc-2.17-260.el7_6.4.x86_64 already installed and latest version
Package 1:make-3.82-23.el7.x86_64 already installed and latest version
Package autoconf-2.69-11.el7.noarch already installed and latest version
Package 1:openssl-1.0.2k-16.el7_6.1.x86_64 already installed and latest version
Package 1:openssl-devel-1.0.2k-16.el7_6.1.x86_64 already installed and latest version
Package pcre-devel-8.32-17.el7.x86_64 already installed and latest version
Package pam-devel-1.1.8-22.el7.x86_64 already installed and latest version
Nothing to do
[root@linux-node3 ~]#安装pam和zlib等（后面的升级操作可能没用到pam，安装上也没啥影响，如果不想安装pam请自行测试）
[root@linux-node3 ~]# yum install -y pam* zlib*
Loaded plugins: fastestmirror
Loading mirror speeds from cached hostfile
* base: mirrors.163.com
* epel: mirrors.aliyun.com
* extras: mirrors.cn99.com
* updates: mirrors.cn99.com
Package pam_yubico-2.26-1.el7.x86_64 already installed and latest version
Package pam_script-1.1.8-1.el7.x86_64 already installed and latest version
Package pam_oath-2.4.1-9.el7.x86_64 already installed and latest version
Package pam_snapper-0.2.8-4.el7.x86_64 already installed and latest version
Package pam_ssh_agent_auth-0.10.3-2.16.el7.x86_64 already installed and latest version
Package pam_2fa-1.0-1.el7.x86_64 already installed and latest version
Package pam_mapi-0.3.4-1.el7.x86_64 already installed and latest version
Package pam_ssh_user_auth-1.0-1.el7.x86_64 already installed and latest version
Package pam_mount-2.16-5.el7.x86_64 already installed and latest version
Package pam_radius-1.4.0-3.el7.x86_64 already installed and latest version
Package pamtester-0.1.2-4.el7.x86_64 already installed and latest version
Package pam_afs_session-2.6-5.el7.x86_64 already installed and latest version
Package pam_pkcs11-0.6.2-30.el7.x86_64 already installed and latest version
Package pam-1.1.8-22.el7.x86_64 already installed and latest version
Package pam_ssh-2.3-1.el7.x86_64 already installed and latest version
Package 1:pam_url-0.3.3-4.el7.x86_64 already installed and latest version
Package pam_wrapper-1.0.7-2.el7.x86_64 already installed and latest version
Package pam-kwallet-5.5.2-1.el7.x86_64 already installed and latest version
Package pam-devel-1.1.8-22.el7.x86_64 already installed and latest version
Package pam_krb5-2.4.8-6.el7.x86_64 already installed and latest version
Package zlib-devel-1.2.7-18.el7.x86_64 already installed and latest version
Package zlib-static-1.2.7-18.el7.x86_64 already installed and latest version
Package zlib-1.2.7-18.el7.x86_64 already installed and latest version
Package zlib-ada-1.4-0.5.20120830CVS.el7.x86_64 already installed and latest version
Package zlib-ada-devel-1.4-0.5.20120830CVS.el7.x86_64 already installed and latest version
Nothing to do
[root@linux-node3 ~]#下载openssh包和openssl的包
我们都下载最新版本，下载箭头指的包
https://openbsd.hk/pub/OpenBSD/OpenSSH/portable/
https://ftp.openssl.org/source/
开始安装openssl
个人习惯把安装包或者工具之类的放下面目录。根据个人喜好随便放，不影响安装
[root@linux-node3 ~]# mkdir /data/tools -p
[root@linux-node3 ~]# cd /data/tools/
[root@linux-node3 /data/tools]# rz -E
rz waiting to receive.
[root@linux-node3 /data/tools]# ll
total 5224
-rw-r--r-- 1 root root 5348369 Apr 27 12:19 openssl-1.0.2r.tar.gz解压文件
[root@linux-node3 /data/tools]# tar xfz openssl-1.0.2r.tar.gz
[root@linux-node3 /data/tools]# ll
total 5228
drwxr-xr-x 20 root root 4096 Apr 27 12:20 openssl-1.0.2r
-rw-r--r-- 1 root root 5348369 Apr 27 12:19 openssl-1.0.2r.tar.gz
[root@linux-node3 /data/tools]# cd
[root@linux-node3 ~]#现在是系统默认的版本，等会升级完毕对比下
[root@linux-node3 ~]# openssl version
OpenSSL 1.0.2k-fips 26 Jan 2017
[root@linux-node3 ~]#备份下面2个文件或目录（如果存在的话就执行）
[root@linux-node3 ~]# ll /usr/bin/openssl
-rwxr-xr-x 1 root root 555248 Mar 12 18:12 /usr/bin/openssl
[root@linux-node3 ~]# mv /usr/bin/openssl /usr/bin/openssl_bak
[root@linux-node3 ~]# ll /usr/include/openssl
total 1864
-rw-r--r-- 1 root root 6146 Mar 12 18:12 aes.h
-rw-r--r-- 1 root root 63204 Mar 12 18:12 asn1.h
-rw-r--r-- 1 root root 24435 Mar 12 18:12 asn1_mac.h
-rw-r--r-- 1 root root 34475 Mar 12 18:12 asn1t.h
-rw-r--r-- 1 root root 38742 Mar 12 18:12 bio.h
-rw-r--r-- 1 root root 5351 Mar 12 18:12 blowfish.h
......
[root@linux-node3 ~]# mv /usr/include/openssl /usr/include/openssl_bak
[root@linux-node3 ~]#编译安装新版本的openssl
配置、编译、安装3个命令一起执行
&&符号表示前面的执行成功才会执行后面的
[root@linux-node3 ~]# cd /data/tools/openssl-1.0.2r/
[root@linux-node3 /data/tools/openssl-1.0.2r]# ./config shared --prefix=/usr/local/ssl && make && make install以上命令执行完毕，echo $?查看下最后的make install是否有报错，0表示没有问题
下面2个文件或者目录做软链接 （刚才前面的步骤mv备份过原来的）
[root@linux-node3 ~]# ln -s /usr/local/ssl/bin/openssl /usr/bin/openssl
[root@linux-node3 ~]# ln -s /usr/local/ssl/include/openssl /usr/include/openssl
[root@linux-node3 ~]# ll /usr/bin/openssl
lrwxrwxrwx 1 root root 26 Apr 27 12:31 /usr/bin/openssl -> /usr/local/ssl/bin/openssl
[root@linux-node3 ~]# ll /usr/include/openssl -ld
lrwxrwxrwx 1 root root 30 Apr 27 12:31 /usr/include/openssl -> /usr/local/ssl/include/openssl
[root@linux-node3 ~]#命令行执行下面2个命令加载新配置
echo "/usr/local/ssl/lib" >> /etc/ld.so.conf
/sbin/ldconfig查看确认版本。没问题
[root@testssh ~]# openssl version
OpenSSL 1.0.2r 26 Feb 2019安装openssh
上传openssh的tar包并解压
[root@testssh ~]# cd /data/tools/
[root@testssh tools]# ll
total 7628
-rw-r--r-- 1 root root 1597697 Apr 18 07:02 openssh-8.0p1.tar.gz
drwxr-xr-x 20 root root 4096 Apr 23 23:12 openssl-1.0.2r
-rw-r--r-- 1 root root 5348369 Feb 26 22:34 openssl-1.0.2r.tar.gz
-rwxr-xr-x 1 root root 853040 Apr 11 2018 sshd
[root@testssh tools]# tar xfz openssh-8.0p1.tar.gz
[root@testssh tools]# cd openssh-8.0p1可能文件默认显示uid和gid数组都是1000，这里重新授权下。不授权可能也不影响安装（请自行测试）
[root@testssh tools]# chown -R root.root /data/tools/openssh-8.0p1命令行删除原先ssh的配置文件和目录
然后配置、编译、安装
注意下面编译安装的命令是一行，请把第一行末尾的 \ 去掉，然后在文本里弄成一行之后放命令行执行
rm -rf /etc/ssh/*
./configure --prefix=/usr/ --sysconfdir=/etc/ssh --with-openssl-includes=/usr/local/ssl/include \
--with-ssl-dir=/usr/local/ssl --with-zlib --with-md5-passwords --with-pam && make && make install参考下我的截图
安装完毕 检查下结果
修改配置文件最终为如下内容，其他的不要动
[root@linux-node3 ~]# grep "^PermitRootLogin" /etc/ssh/sshd_config
PermitRootLogin yes
[root@linux-node3 ~]# grep "UseDNS" /etc/ssh/sshd_config
UseDNS no
[root@linux-node3 ~]#从原先的解压的包中拷贝一些文件到目标位置（如果目标目录存在就覆盖）
(可能下面的ssh.pam文件都没用到，因为sshd_config配置文件貌似没使用它，请自行测试。我这边是拷贝了)
[root@linux-node3 /data/tools/openssh-8.0p1]# cd /data/tools/openssh-8.0p1
[root@linux-node3 /data/tools/openssh-8.0p1]# cp -a contrib/redhat/sshd.init /etc/init.d/sshd
[root@linux-node3 /data/tools/openssh-8.0p1]# cp -a contrib/redhat/sshd.pam /etc/pam.d/sshd.pam
[root@linux-node3 /data/tools/openssh-8.0p1]# chmod +x /etc/init.d/sshd
[root@linux-node3 /data/tools/openssh-8.0p1]# chkconfig --add sshd
[root@linux-node3 /data/tools/openssh-8.0p1]# systemctl enable sshd
[root@linux-node3 /data/tools/openssh-8.0p1]#把原先的systemd管理的sshd文件删除或者移走或者删除，不移走的话影响我们重启sshd服务
[root@linux-node3 ~]# mv /usr/lib/systemd/system/sshd.service /data/设置sshd服务开机启动
[root@linux-node3 ~]# chkconfig sshd on
Note: Forwarding request to 'systemctl enable sshd.socket'.
Created symlink from /etc/systemd/system/sockets.target.wants/sshd.socket to /usr/lib/systemd/system/sshd.socket.接下来测试启停服务。都正常
以后管理sshd通过下面方式了
[root@linux-node3 ~]# /etc/init.d/sshd restart
Restarting sshd (via systemctl): [ OK ]
[root@linux-node3 ~]#
[root@linux-node3 ~]#
[root@linux-node3 ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 31800/sshd
tcp6 0 0 :::22 :::* LISTEN 31800/sshd
tcp6 0 0 :::23 :::* LISTEN 1/systemd
[root@linux-node3 ~]# /etc/init.d/sshd stop
Stopping sshd (via systemctl): [ OK ]
[root@linux-node3 ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp6 0 0 :::23 :::* LISTEN 1/systemd
[root@linux-node3 ~]# /etc/init.d/sshd start
Starting sshd (via systemctl): [ OK ]
[root@linux-node3 ~]#
[root@linux-node3 ~]#使用systemd方式也行
[root@linux-node3 ~]# systemctl stop sshd
[root@linux-node3 ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp6 0 0 :::23 :::* LISTEN 1/systemd
[root@linux-node3 ~]# systemctl start sshd
[root@linux-node3 ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 31958/sshd
tcp6 0 0 :::22 :::* LISTEN 31958/sshd
tcp6 0 0 :::23 :::* LISTEN 1/systemd
[root@linux-node3 ~]# systemctl restart sshd
[root@linux-node3 ~]# netstat -lntp
Active Internet connections (only servers)
Proto Recv-Q Send-Q Local Address Foreign Address State PID/Program name
tcp 0 0 0.0.0.0:22 0.0.0.0:* LISTEN 31999/sshd
tcp6 0 0 :::22 :::* LISTEN 31999/sshd
tcp6 0 0 :::23 :::* LISTEN 1/systemd
[root@linux-node3 ~]#测试版本。都正常
[root@linux-node3 ~]# ssh -V
OpenSSH_8.0p1, OpenSSL 1.0.2r 26 Feb 2019
[root@linux-node3 ~]#
下面的如果不行，可以到另一个机器上telnet这个机器试一下。
[root@linux-node3 ~]# telnet 127.0.0.1 22
Trying 127.0.0.1...
Connected to 127.0.0.1.
Escape character is '^]'.
SSH-2.0-OpenSSH_8.0可以登录到另一个机器上试一下能够ssh到这个机器上，如果xshell版本低可能报“找不到匹配的host key算法”，可以用mobaxterm登录试一下，或者升级xshell。
如果不是生产机器。可以试着重启机器测试下登录sshd是否正常。我这边测试都没问题
测试没问题后可以把telnet服务关闭了
[root@linux-node3 ~]# systemctl disable xinetd.service
Removed symlink /etc/systemd/system/multi-user.target.wants/xinetd.service.
[root@linux-node3 ~]# systemctl stop xinetd.service
[root@linux-node3 ~]# systemctl disable telnet.socket
[root@linux-node3 ~]# systemctl stop telnet.socket
[root@linux-node3 ~]# netstat -lntp
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