Get started with CentOS service commands

Get started with CentOS service commands
(1) System Architecture

View the kernel
Shell code

1. # Uname-s-r
2. Linux2.6.32-358. el6.x86 _ 64

View released versions
Shell code

1. # Cat/etc/redhat-release
2. CentOSrelease6.4 (Final)

View CPU architecture
Shell code

1. # Arch
2. X86_64 (x86_64 indicates 64-bit machines/i686 indicates 32-bit machines)
3. # GetconfLONG_BIT
4. 64

(2) user settings

Add User
Shell code

1. #/Usr/sbin/useradduser1-d/home/user1-Gnobody
2. # Passwduser1
3. Newpassword: 123456.
4. Retypenewpassword: 123456
5. Passwd: allauthenticationtokensupdatedsuccessfully.

Confirm user
Shell code

1. # Iduser1

Delete a user
Shell code

1. # Userdel-ruser1

Grant root permission
Shell code

1. # Usermod-Gwheelhoge
2. # Vi/etc/pam. d/su
3. Authrequiredpam_wheel.souse_uid # <= Cancel Annotation

User Overview
Shell code

1. # Cat/etc/passwd

(3) network settings

Set IP
Shell code

1. # Vi/etc/sysconfig/network-scripts/ifcfg-eth0
2. DEVICE = "eth0"
3. OTPROTO = "static" # <=
4. HWADDR = "00: 0C: 29: 53: A5: AE"
5. IPV6INIT = "no" # <=
6. NM_CONTROLLED = "yes"
7. ONBOOT = "yes"
8. TYPE = "Ethernet"
9. UUID = "1ca6acf4-ebce-415a-a89b-bf89a67819ff"
10. IPADDR = "xxx. xxx. xx. xx" # <=
11. NETMASK = "255.255.255.0" # <=
12. GATEWAY = "xxx. xxx. xx. xx" # <=
13. DNS1 = "xxx. xxx. xx. xx" # <=
15. # Servicenetworkrestart
16. Shuttingdowninterfaceeth0:
17. ......
18. Connectionactivated [OK]
20. # Ifconfig
21. Eth0Linkencap: EthernetHWaddr00: 0C: 29: 2F: D5: 58
22. Inetaddr: xxx. xxx. xx. xxBcast: xxx. xxx. xx. xxMask: 255.255.255.0
23. ......

Uninstall the NestworkManager Service
Shell code

1. # ChkconfigNetworkManageroff
2. # Yum-yremoveNetworkManager

Disable IPv6
Shell code

1. # Serviceip6tablesstop
2. # Chkconfigip6tablesoff
3. # Echo "installipv6/bin/true">/etc/modprobe. d/disable-ipv6.conf
4. # Vi/etc/sysconfig/network
5. NETWORKING_IPV6 = no
6. IPV6INIT = no
7. # Vi/etc/sysconfig/network-scripts/ifcfg-eth0
8. # Shutdown-rnow
9. # Lsmod | grepipv6
10. No ipv6 Module
11. # Netstat-an | grepffff
12. No: ffff: Starting IP Address
13. # Ifconfig
14. No text starting with inet6addr

(4) package management settings

Yum cleanup
Shell code

1. # Yumcleanall
2. Loadedplugins: fastestmirror, security
3. Cleaningrepos: baseextrasupdates
4. CleaningupEverything
5. # Yummakecache
6. Loadedplugins: fastestmirror, security
7. Determiningfastestmirrors
8. .............
9. MetadataCacheCreated

Yum update
Shell code

1. # Yum-yupdate

Automatic update
Shell code

1. # Yum-yinstallyum-cron
2. # Vi/etc/sysconfig/yum-cron
3. CHECK_ONLY = yes
4. DOWNLOAD_ONLY = yes
5. #/Etc/rc. d/init. d/yum-cronstart
6. # Chkconfigyum-cronon
7. # Chkconfig -- listyum-cron

Automatically find the fastest Image
Shell code

1. # Yum-yinstallyum-plugin-fastestmirror
2. # Vi/etc/yum/pluginconf. d/fastestmirror. conf
3. Enabled = 0 disabled 0: Invalid 1: VALID

Add repository
Shell code

1. # Vi/etc/yum. repos. d/CentOS-Base.repo
3. # Rpm-Uvhhttp: // pkgs.repoforge.org/rpmforge-release/rpmforge-release-0.5.3-1.el6.rf.x86_64.rpm
4. # Vi/etc/yum. repos. d/rpmforge. repo
5. Enabled = 0
6. # Yum -- enablerepo = rpmforgeinstallxxxx
8. # Rpm-Uvhhttp: // ftp.riken.jp/Linux/fedora/epel/6/x86_64/epel-release-6-8.noarch.rpm
9. # Vi/etc/yum. repos. d/epel. repo
10. Enabled = 0
11. # Yum -- enablerepo = epelinstallxxxx

(5) set vim
Shell code

1. # Yum-yinstallvim-enhanced
2. # Vi/etc/profile
3. Aliasvi = 'vim'
4. # Source/etc/profile
5. # Vi/etc/vimrc

(6) Security Settings

Disable SELinux
Shell code

1. # Getenforce
2. # Setenforce0 disable temporarily
3. # Vi/etc/sysconfig/selinux
4. SELINUX = enforcing
5. Bytes
6. SELINUX = disabled

Stop iptables
Shell code

1. #/Etc/rc. d/init. d/iptablesstop
2. Iptables: Flushingfirewallrules: [OK]
3. Iptables: SettingchainstopolicyACCEPT: filter [OK]
4. Iptables: Unloadingmodules: [OK]
5. # Chkconfigiptablesoff
6. # Chkconfig -- listiptables
7. Iptables0: off1: off2: off3: off4: off5: off6: off

(7) System Operation

Disk usage
Shell code

1. # Df-h
3. # Yum-yinstallsysstat
4. # Iostat

Memory usage
Shell code

1. # Free-m

CPU and memory
Shell code

1. # Cat/proc/cpuinfo
2. # Cat/proc/meminfo

(8) Others

Local Language
Shell code

1. # Yum-ygroupinstall "JapaneseSupport"
2. # Vi/etc/sysconfig/i18n
3. LANG = "en_US.UTF-8"
4. Bytes
5. LANG = "ja_JP.UTF-8"
6. # Source/etc/sysconfig/i18n
7. # Echo $ LANG
8. Ja_JP.UTF-8
9. # Shutdown-rnow

Stop unnecessary services
Shell code

1. # Chkconfig -- list | grep3: on
2. # Serviceip6tablesstop
3. # Chkconfigip6tablesoff

Network Kanji Filter)
Shell code

1. # Yum-yinstallnkf
2. #Vireadme.txt
3. Test
4. Character
5. #Nkf-greadme.txt
6. UTF-8 (LF)
7. #Nkf-s--overwritereadme.txt
8. #Nkf-greadme.txt
9. Shift_JIS (LF)
10. #Nkf-j--overwritereadme.txt
11. #Nkf-greadme.txt
12. ISO-2022-JP (LF)

Install gcc
Shell code

1. # Rpm-qagcc
2. # Yum-yinstallgccgcc-c ++
3. # Gcc-v
4. Usingbuilt-inspecs.
5. Target: i686-redhat-linux
6. ............
7. Gccversion4.4.720120313 (RedHat4.4.7-4) (GCC)

Install PCRE
Shell code

1. # Cd/usr/local/src
2. # Wgetftp: // ftp. csx. cam. ac. uk/pub/software/programming/pcre/pcre-8.35.tar.gz
3. #Tarzxvfpcre-8.35.tar.gz
4. # Cd/usr/local/src/pcre-8.35
5. #./Configure -- prefix =/usr/local/pcre/8.35
6. # Makeclean
7. # Make & makeinstall
8. # PATH =/usr/local/pcre/8.35/bin: $ PATH
9. # Vi/etc/ld. so. conf
10. /Usr/local/pcre/8.35/lib merge appended at the end
11. # Ldconfig
12. # Rpm-qapre
13. Pcre-7.8-6.el6.x86_64
14. # Pcretest-C
15. PCREversion7.82008-09-05

Install OpenSSL
Shell code

1. # Cd/usr/local/src
2. # Wgethttp: // www.openssl.org/source/openssl-1.0.1h.tar.gz
3. #Tarxzvfopenssl-1.0.1h.tar.gz
4. # Cdopenssl-1.0.1h
5. #./Configshared-fPIC
6. # Make & makeinstall
7. # Vi/etc/ld. so. conf
8. /Usr/local/ssl/lib labels appended at the end
9. # Ldconfig
10. # Ldconfig-f/etc/ld. so. conf-vp | grepssl/lib
11. Libssl. so.1.0.0 (libc6) =>/usr/local/ssl/lib/libssl. so.1.0.0
12. Libssl. so (libc6) =>/usr/local/ssl/lib/libssl. so
13. Libcrypto. so.1.0.0 (libc6) =>/usr/local/ssl/lib/libcrypto. so.1.0.0
14. Libcrypto. so (libc6) =>/usr/local/ssl/lib/libcrypto. so
15. #/Usr/local/ssl/bin/opensslversion
16. OpenSSL1.0.1h5Jun2014

NTP synchronization time
Reference # yum-y install ntp
# Mv/etc/ntp. conf/etc/ntp.conf.org
# Vi/etc/ntp. conf
Driftfile/var/lib/ntp/drift
Server 0.jp.pool.ntp.org
Server 1.jp.pool.ntp.org
Server 2.jp.pool.ntp.org
Server 3.jp.pool.ntp.org
# Ntpdate 0.jp.pool.ntp.org
#/Etc/init. d/ntpd start
# Ntpq-p
# NtpstatShell code

1. # Yumupdateglibc
2. # Rpm-qa | grepglibc
3. 2.12-1.149.el6 _ 6.5