FreeBSD常用操作

导读	最近遇到一些FreeBSD的故障，在这种操作系统上我们平时用的一些命令无法执行，FreeBSD的一些配置文件也和其他很多Linux系统不一样。为了方便以后查阅，我特别整理了这篇文档。

1. 网络

重启网络的命令：

/etc/rc.d/netif restart , /etc/netstart restart

网络配置文件：

root@mhxy-compile02:~ # cat /etc/rc.conf
ifconfig_em0="DHCP"
sshd_enable="NO"
ntpd_enable="YES"
# Set dumpdev to "AUTO" to enable crash dumps, "NO" to disable
dumpdev="AUTO"
zfs_enable="YES"
puppet_enable="YES"
ipv6_enable="NO"

hostname="mhxy-compile02.i.nease.net"

nfs_client_enable="YES"
rpc_lockd_enable="YES"
rpc_statd_enable="YES"

2. SSH

命令：

/etc/rc.d/sshd start , /etc/rc.d/sshd restart

SSH配置文件：

root@mhxy-compile02:~ # cat /etc/ssh/sshd_config
# THIS FILE IS AUTOMATICALLY GENERATED BY PUPPET.
# DO NOT EDIT THIS FILE.

# 1. Basic
Port 32200
Protocol 2

# 2. Authentication
HostKey /etc/ssh/ssh_host_rsa_key
HostKey /etc/ssh/ssh_host_dsa_key

KeyRegenerationInterval 3600
ServerKeyBits 768
UsePrivilegeSeparation yes
LoginGraceTime 120

PermitRootLogin no
StrictModes yes

RSAAuthentication yes
PubkeyAuthentication yes
PermitEmptyPasswords no
ChallengeResponseAuthentication no
PasswordAuthentication no

IgnoreRhosts yes
RhostsRSAAuthentication no
HostbasedAuthentication no

# 3. Features
UseDNS no
X11Forwarding yes
X11DisplayOffset 10
PrintMotd no
PrintLastLog yes
TCPKeepAlive yes
AcceptEnv LANG LC_*

# 4. Logging
SyslogFacility AUTH
LogLevel INFO

# 5. x509
Subsystem sftp /usr/libexec/sftp-server
#CACertificateFile /etc/ssh/ca/ca.cer

3. 防火墙

1)停止ipfw防火墙：
ipfw disable firewall
/etc/rc.d/ipfw stop

2)开启ipfw防火墙：

ipfw enable firewall
/etc/rc.d/ipfw start

3）清防火墙
ipf -Fa

4.赋予用户root权限

1）pw groupmod wheel -m
2）pw user mod  -g wheel

5.查看CPU和内存

1)sysctl kern.smp.cpus或dmesg |grep cpu  #查看CPU个数
2）dmesg|more或top   #查看内存