Centos7.2 Install & Config

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1. 手动分区

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/boot   for 200m ext4
swap    for 2G  swap
/home   for 2G  ext4
/       the rest

image

2. IP addr

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ifconfig not found

CentOS 7 minimal systems, use the commands “ip addr” and “ip link” to find the details of a network interface card. To know the statistics use “ip -s link”.

Install ifconfig

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yum provides ifconfig
yum install net-tools

Mind: BOTH ifconfig and netstat is obsolete, use ip and ss instead.

3. 配置静态IP地址

  1. 查看网络管理器服务的状态：
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[root@localhost network-scripts]# systemctl status NetworkManager.service
  1. 查看网络管理器管理的网络接口: (for eno167 is our goal)
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[root@localhost network-scripts]# nmcli dev status
DEVICE       TYPE      STATE      CONNECTION
eno16777736  ethernet  connected  eno16777736
lo           loopback  unmanaged  --
  1. 修改配置文件
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vim /etc/sysconfig/network-scripts/eno16777736
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*BOOTPROTO="static"
DEFROUTE="yes"
IPV4_FAILURE_FATAL="no"
IPV6INIT="yes"
IPV6_AUTOCONF="yes"
IPV6_DEFROUTE="yes"
IPV6_FAILURE_FATAL="no"
NAME="eno16777736"
UUID="4c9bca38-d727-4352-b5c9-a4be75a8ed62"
DEVICE="eno16777736"
ONBOOT="yes"
PEERDNS="yes"
PEERROUTES="yes"
IPV6_PEERDNS="yes"
IPV6_PEERROUTES="yes"
IPV6_PRIVACY="no"
*NM_CONTROLLED=no       #不通过网络管理器管理
*IPADDR=192.168.1.15    #must
*DNS1={DNS}
*IPADDR=10.200.157.84
*NETMASK=255.255.255.0
*DNS1=10.133.1.254
  1. 重启网络服务：
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systemctl restart network.service
  1. ping connect: Network is unreachable
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ping -c 4 192.168.1.9

用指令dhclient來與DHCP連線:

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$ dhclient

  1. yum “Couldn’t resolve host ‘mirrorlist.centos.org’” for CentOS 6

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    # vim /etc/resolv.conf

    And append:

     nameserver 8.8.8.8 nameserver 8.8.4.4 nameserver 127.0.0.1

  2. If still failed to connect outer network:

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    /etc/sysconfig/network:

    NETWORKING=yes
    HOSTNAME=centos7
    GATEWAY=10.0.0.1
    /etc/resolv.conf:

    nameserver 8.8.8.8
    nameserver 8.8.4.4

  3. Destination unreachable / No route to host / 断网等各种事件
    因为VM ware Bridge 模式无法使用，在虚拟机网络编辑器里重置默认值，然后在win10宿主机中为VM net的属性中选上Bridge protocol.

究极大法：Shutdown all VMs, Reboot Host, Reset VMware adapter, Boot VMs, Shutdown firewall

4. Install lrzsz Error

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Error downloading packages: lrzsz-0.12.20-36.el7.x86_64: [Errno 256] No more mirrors to try.

Try this:

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$ yum clean all
$ yum makecache

and dhclient if necessary

5. 防火墙问题

Visit tomcat at http://192.168.1.15:8080/ failed.
Caused by firewall, stop or disable it:

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$ systemctl stop firewalld.service

OR

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[root@localhost ~]# systemctl disable firewalld.service
Removed symlink /etc/systemd/system/basic.target.wants/firewalld.service.
Removed symlink /etc/systemd/system/dbus-org.fedoraproject.FirewallD1.service.

OR 允许8080端口流量通过

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firewall-cmd --zone= --add-port=8080/tcp --permanent

参考：

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firewall-cmd --state # 检查防火墙状态
firewall-cmd --add-service=http --permanent # 允许服务流量通过防火墙，后跟 --permanent 为永久修改，否则重载以后就不失效了
firewall-cmd --zone= --add-port=80/tcp --permanent # 允许端口流量通过防火墙
firewall-cmd --reload # 重新加载防火墙

Red Hat 防火墙使用

6. Hostname 修改

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[root@localhost ~]# hostnamectl set-hostname master15

查看结果(静态、瞬态和灵活主机名):

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$ hostnamectl status

注意

对于静态/瞬态主机名，任何特殊字符或空格都会被移除，字母转小字。修改静态主机名，/etc/hostname 将被自动更新。但/etc/hosts需要手动更新。

7. User and SSH

Initial new server by new user and SSH:
New Server Initial

8. Configuring Basic Firewall

Start up firewalld:

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sudo systemctl start firewalld

Allow SSH with default port:

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sudo firewall-cmd --permanent --add-service=ssh

Timezone config:

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sudo timedatectl
sudo timedatectl set-timezone Asia/Shanghai

ntpdate time.windows.com 
hwclock -w