标题：[实践OK]ssh太慢，CentOS6.X下编译并升级安装OpenSSH7.4p1，一台CentOS6.X机器连接SSH太慢，重新编译最新的openssh后连接正常的编译过程。 出处：向东博客 专注WEB应用 构架之美 --- 构架之美，在于尽态极妍 | 应用之美，在于药到病除 时间：Fri, 17 Aug 2018 11:05:04 +0000 作者：jackxiang 地址：http://jackxiang.com/post/9860/ 内容： 导语 Redhat企业级系统的6.7版自带SSH版本为OpenSSH_5.3p1, 基于审计和安全性需求，建议将其升级到最新的OpenSSH版本，当前官网最新版本为7.4p1. 本文档将详细介绍OpenSSH升级的完整步骤。需要说明的是，升级过程中虽然涉及zlib、openssl和openssh的卸载，但是并不会导致当前的ssh远程连接会话断开，因此是可以将整个升级过程写成自动化脚本以进行自动批量部署的。后面咱准备逐步过度到CentOS7了，新版在SSH底层上优化了TCP连接传输功能。在譬如拷贝时会用同一个TCP的FD，而旧版本的是没有这个功能的。再就是刚连接过了在超时设置范围内，再次发起连接时也会复用之前的一个Socket的FD句柄，提高连接效率。 编译安装OpenSSH7.4p1一共分二步， 第一步：安装编译需要的RPM包： yum install gcc -y yum install audit-libs glibc keyutils-libs krb5-libs libcom_err libselinux nss-softokn-freebl openssl pam zlib -y 第二步：编译并安装到和原来一样的目录，如下步骤： tar zxvf openssh-7.4p1.tar.gz cd openssh-7.4p1 ll ./configure --prefix=/usr --sysconfdir=/etc/ssh --with-pam --with-zlib --with-md5-passwords --with-kerberos5=/usr/lib64/libkrb5.so make && make install cp -rf /usr/local/src/openssh-7.4p1/contrib/redhat/sshd.init /etc/init.d/sshd cp -rf contrib/redhat/sshd.init /etc/init.d/sshd chmod +x /etc/init.d/sshd chkconfig --add sshd vim /etc/init.d/sshd sed -i '/sbin/restorecon /etc/ssh/ssh_host_key.pub/s/^/#/' /etc/init.d/sshd sed -i 's/#PermitRootLogin/PermitRootLogin/' /etc/ssh/sshd_config vim /etc/ssh/sshd_config ssh -V service sshd restart vim /etc/ssh/sshd_config ll vim /etc/ssh/sshd_config ps -ef|grep ssh service sshd start history 附录： 反查一些OpenSSH需要的动态库，RPM包的安装路径辅助上面参数配置： rpm -ql openssh-server-5.3p1-122.el6.x86_64 /etc/pam.d/ssh-keycat /etc/pam.d/sshd /etc/rc.d/init.d/sshd /etc/ssh/sshd_config /etc/sysconfig/sshd /usr/libexec/openssh/sftp-server /usr/libexec/openssh/ssh-keycat /usr/sbin/.sshd.hmac /usr/sbin/sshd /usr/share/doc/openssh-server-5.3p1 /usr/share/doc/openssh-server-5.3p1/HOWTO.ssh-keycat /usr/share/man/man5/moduli.5.gz /usr/share/man/man5/sshd_config.5.gz /usr/share/man/man8/sftp-server.8.gz /usr/share/man/man8/sshd.8.gz /var/empty/sshd ldd /usr/sbin/sshd linux-vdso.so.1 => (0x00007fffbc5ff000) libpam.so.0 => /lib64/libpam.so.0 (0x00007f2d19bf3000) libcrypto.so.10 => /usr/lib64/libcrypto.so.10 (0x00007f2d1980e000) librt.so.1 => /lib64/librt.so.1 (0x00007f2d19605000) libdl.so.2 => /lib64/libdl.so.2 (0x00007f2d19401000) libutil.so.1 => /lib64/libutil.so.1 (0x00007f2d191fe000) libz.so.1 => /lib64/libz.so.1 (0x00007f2d18fe7000) libcrypt.so.1 => /lib64/libcrypt.so.1 (0x00007f2d18db0000) libresolv.so.2 => /lib64/libresolv.so.2 (0x00007f2d18b96000) libgssapi_krb5.so.2 => /lib64/libgssapi_krb5.so.2 (0x00007f2d18951000) libkrb5.so.3 => /lib64/libkrb5.so.3 (0x00007f2d1866a000) libk5crypto.so.3 => /lib64/libk5crypto.so.3 (0x00007f2d1843e000) libcom_err.so.2 => /lib64/libcom_err.so.2 (0x00007f2d18239000) libc.so.6 => /lib64/libc.so.6 (0x00007f2d17ea5000) libaudit.so.1 => /lib64/libaudit.so.1 (0x00007f2d17c89000) libpthread.so.0 => /lib64/libpthread.so.0 (0x00007f2d17a6b000) /lib64/ld-linux-x86-64.so.2 (0x0000003c0e400000) libfreebl3.so => /lib64/libfreebl3.so (0x00007f2d177f4000) libkrb5support.so.0 => /lib64/libkrb5support.so.0 (0x00007f2d175e9000) libkeyutils.so.1 => /lib64/libkeyutils.so.1 (0x00007f2d173e5000) libselinux.so.1 => /lib64/libselinux.so.1 (0x00007f2d171c6000) rpm -qf /lib64/libpam.so.0 >> /tmp/jackRpmResult.txt rpm -qf /usr/lib64/libcrypto.so.10 >> /tmp/jackRpmResult.txt rpm -qf /lib64/librt.so.1 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libdl.so.2 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libutil.so.1 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libz.so.1 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libcrypt.so.1 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libresolv.so.2 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libgssapi_krb5.so.2 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libkrb5.so.3 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libk5crypto.so.3 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libcom_err.so.2 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libc.so.6 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libaudit.so.1 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libpthread.so.0 >> /tmp/jackRpmResult.txt rpm -qf /lib64/ld-linux-x86-64.so.2 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libfreebl3.so >> /tmp/jackRpmResult.txt rpm -qf /lib64/libkrb5support.so.0 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libkeyutils.so.1 >> /tmp/jackRpmResult.txt rpm -qf /lib64/libselinux.so.1 >> /tmp/jackRpmResult.txt 需要这些包： rpm -qa|grep audit-libs-2.2-2 rpm -qa|grep glibc-2.12-1.192 rpm -qa|grep keyutils-libs-1.4-5 rpm -qa|grep krb5-libs-1.10.3-65 rpm -qa|grep libcom_err-1.41.12-23 rpm -qa|grep libselinux-2.0.94-7 rpm -qa|grep nss-softokn-freebl-3.14.3-9 rpm -qa|grep openssl-1.0.1e-57 rpm -qa|grep pam-1.1.1-24 rpm -qa|grep zlib-1.2.3-29 yum 安装软件包： audit-libs-2.2-2 glibc-2.12-1.192 keyutils-libs-1.4-5 krb5-libs-1.10.3-65 libcom_err-1.41.12-23 libselinux-2.0.94-7 nss-softokn-freebl-3.14.3-9 openssl-1.0.1e-57 pam-1.1.1-24 zlib-1.2.3-29 去掉版本号直接安装： yum install audit-libs glibc keyutils-libs krb5-libs libcom_err libselinux nss-softokn-freebl openssl pam zlib 参考编译来源： （1）http://blog.chinaunix.net/uid-28266791-id-5759478.html （2）https://www.cnblogs.com/xshrim/p/6472679.html Generated by Jackxiang's Bo-blog 2.1.1 Release