Centos7 install ssh service

Reprinted from: https://blog.csdn.net/mengyoufengyu/article/details/72855524

1. Check whether the related software is installed:

rpm -qa|grep -E "openssh"

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If the displayed result contains the following three softwares, it means that it has been installed, otherwise the missing software needs to be installed

openssh-ldap-6.6.1p1-35.el7_3.x86_64 
openssh-clients-6.6.1p1-35.el7_3.x86_64 
openssh-6.6.1p1-35.el7_3.x86_64 
openssh-askpass-6.6.1p1-35.el7_3.x86_64 
openssh-server-6.6.1p1-35.el7_3.x86_64 
openssh-keycat-6.6.1p1-35.el7_3.x86_64 
openssh-server-sysvinit-6.6.1p1-35.el7_3.x86_64

2. Install the missing software:

sudo yum install openssh*

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3. Register to use the service:

sudo systemctl enable sshd  
sudo systemctl start sshd 或者
service sshd start 

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4. Open port 22 of the firewall: 
For specific firewall usage, please refer to: http://www.cnblogs.com/moxiaoan/p/5683743.html

sudo firewall-cmd --zone=public --add-port=22/tcp --permanent  
sudo service firewalld restart  

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5. Note: If the virtual machine is tested with the host, the network mode needs to be changed to 2. Bridged Adapter, see: http://blog.csdn.net/ixidof/article/details/12685549