redhat5.8系统学习

# redhat5.8系统学习

### 简介
-----------------------------
redhat操作系统是红帽公司的收费版操作系统

### 查看系统版本号
-----------------------------
- 提供3种方式
- 最好用的方式 `cat /etc/release`
- 一般不用 `cat /etc/issue`
- 发行版信息 `lsb_release -a`
```
[root@dbtest ~]# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.8 (Tikanga)
[root@dbtest ~]# cat /etc/issue
Red Hat Enterprise Linux Server release 5.8 (Tikanga)
Kernel \r on an \m

[root@dbtest ~]# lsb_release -a
LSB Version: :core-4.0-amd64:core-4.0-ia32:core-4.0-noarch:graphics-4.0-amd64:graphics-4.0-ia32:graphics-4.0-noarch:printing-4.0-amd64:printing-4.0-ia32:printing-4.0-noarch
Distributor ID: RedHatEnterpriseServer
Description: Red Hat Enterprise Linux Server release 5.8 (Tikanga)
Release: 5.8
Codename: Tikanga
```

### 网络配置
-----------------------------
- 网卡配置 `vi /etc/sysconfig/network-scripts/ifcfg-eth0`
- 网关配置 `vi /etc/sysconfig/network`
- 自动产生的域名解析配置 `vi /etc/resolv.conf`
- 重启网络服务 `service network restart`
- 网卡配置和网关配置中的GATEWAY，和域名解析配置中的nameserver配置一样就可以了
- 上面一条非常重要，**否则就是域名也正常解析，就是ping不通**

```
# -----------------------------------------------------
# -------/etc/sysconfig/network-scripts/ifcfg-eth0
# -----------------------------------------------------
# Intel Corporation 82545EM Gigabit Ethernet Controller (Copper)
DEVICE=eth0
BOOTPROTO=dhcp
ONBOOT=yes
HWADDR=00:0c:29:c5:4b:ec
TYPE=Ethernet
GATEWAY=192.168.96.2

# -----------------------------------------------------
# -------/etc/sysconfig/network
# -----------------------------------------------------
NETWORKING=yes
NETWORKING_IPV6=no
HOSTNAME=dbtest.oracle.com
GATEWAY=192.168.96.2

# -----------------------------------------------------
# -------/etc/resolv.conf
# -----------------------------------------------------
; generated by /sbin/dhclient-script
search localdomain
nameserver 192.168.96.2
```