VMware install Linux System Considerations

1. Turn off the firewall

[Reference link] https://www.cnblogs.com/moxiaoan/p/5683743.html

CentOS7 use firewalld turn off the firewall and open ports

The basic use of firewalld

启动： systemctl start firewalld
关闭： systemctl stop firewalld
查看状态： systemctl status firewalld 
开机禁用  ： systemctl disable firewalld
开机启用  ： systemctl enable firewalld

systemctl is CentOS7 service management tool in the main tool before it blends service and chkconfig functions in one

启动一个服务：systemctl start firewalld.service
关闭一个服务：systemctl stop firewalld.service
重启一个服务：systemctl restart firewalld.service
显示一个服务的状态：systemctl status firewalld.service
在开机时启用一个服务：systemctl enable firewalld.service
在开机时禁用一个服务：systemctl disable firewalld.service
查看服务是否开机启动：systemctl is-enabled firewalld.service
查看已启动的服务列表：systemctl list-unit-files|grep enabled
查看启动失败的服务列表：systemctl --failed

Configuring firewalld-cmd

查看版本： firewall-cmd --version
查看帮助： firewall-cmd --help
显示状态： firewall-cmd --state
查看所有打开的端口： firewall-cmd --zone=public --list-ports
更新防火墙规则： firewall-cmd --reload
查看区域信息:  firewall-cmd --get-active-zones
查看指定接口所属区域： firewall-cmd --get-zone-of-interface=eth0
拒绝所有包：firewall-cmd --panic-on
取消拒绝状态： firewall-cmd --panic-off
查看是否拒绝： firewall-cmd --query-panic

Open a port

Add to

firewall-cmd --zone=public --add-port=80/tcp --permanent    （--permanent永久生效，没有此参数重启后失效）

Reload

firewall-cmd --reload

View

firewall-cmd --zone= public --query-port=80/tcp

delete

firewall-cmd --zone= public --remove-port=80/tcp --permanent

2. Network virtual network and system configuration of Vmware

[Reference link] https://www.cnblogs.com/maowenqiang/articles/7727910.html

ping: www.baidu.com: Name or service not known # This error occurs because the network system is configured correctly with VMware

View Network Configuration

记住NAT设置中的子网IP、子网掩码、网关IP三项，接下来配置文件主要是这三项。

Editing in Linux network configuration files

vi /etc/sysconfig/network-scripts/ifcfg-ens33 # Note the network configuration file name may be different, when you enter into the ifcfg, continuous double-click the tab key, get tips, such as my machine is ifcfg-ens33

Content replaced by the following:

TYPE=”Ethernet” 
BOOTPROTO=”static” #静态连接 
NAME=”ens33” 
UUID=”1f093d71-07de-4ca5-a424-98e13b4e9532” 
DEVICE=”ens33” 
ONBOOT=”yes” #网络设备开机启动 
IPADDR=”192.168.0.101” #192.168.59.x, x为3~255. 
NETMASK=”255.255.255.0” #子网掩码 
GATEWAY=”192.168.66.2” #网关IP

DNS1= 8.8.8.8

DNS2=8.8.8.4

View Network Configuration
Network Service Restart

service network restart

Test results

ping 192.168.66.2 
ping 115.239.210.27 （百度的某个IP，直接ping www.baidu.com 会出现域名解析问题，在保证网络连通后可进行配置）

DNS configuration file

vi /etc/resolv.conf 
nameserver 8.8.8.8
nameserver 8.8.4.4

test

ok!

3. Configure the update source

　Ali (Click on the far right to find the corresponding system help) or Qinghua source (click on the top of the system to find the corresponding question mark)

Tsinghua source

Configuring SSH

[Reference link] https://blog.csdn.net/wang704987562/article/details/72722263

centos7 install SSH

1. Install OpenSSH server (CentOS system installed by default openssh)

yum install openssh-server -y

2. Configure OpenSSH service (the default configuration is working properly)

OpenSSH main configuration file: / etc / ssh / sshd_config

Common configuration options:

Port=22  设置SSH的端口号是22(默认端口号为22)

Protocol 2  启用SSH版本2协议

ListenAddress 192.168.0.222  设置服务监听的地址

DenyUsers   user1 user2 foo  拒绝访问的用户(用空格隔开)

AllowUsers  root osmond vivek  允许访问的用户(用空格隔开)

PermitRootLogin  no  禁止root用户登陆

PermitEmptyPasswords no  用户登陆需要密码认证

PasswordAuthentication  yes  启用口令认证方式
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3. Restart the OpenSSH service

 service sshd restart

4. The client via the remote connection server ssh

ssh username@hostname(hostIP)

Such as: ssh [email protected]