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#format wiki
#language en
= RedHat =
 * Set-up and installation notes.
 * Add new yum repo
   {{{
     sudo wget -P /etc/yum.repos.d/  ftp://server1/pub/gls/server1.repo
   }}}
 * Start / Stop a service.
   {{{
    $ sudo /sbin/service httpd stop
    $ sudo /sbin/chkconfig httpd off
    OR
    System->Admin->Services
   }}}
 * YUM
   {{{
     yum localinstall xxxxx.rpm
     yum clean dbcache / all
   }}}
 * Persistent Kernel Configuration sysctl, add to /proc/sys
   {{{
     sysctl -a
     sysctl -p   << Process sysctl.conf
   }}}
 * fdisk & partitions
  {{{
     partprove   << reinitializes the kernel's in-memory version of the partition table
     e2label /dev/sdX MYfsLabel
       mount LABEL-MYfsLabel /mnt
     blkid   << show all labels
     tune2fs -o acl,user_xattr /dev/sda2   << set default mount options., check with dumpe2fs
  }}}
 * ACL's  (mounted with -o acl)
   * New files inherit default ACL from dir, mv and cp -p preserve ACL's
   {{{
   getfacl
   setfacl
   -m modify,  -x remove,   d-default set on dir
   }}}
 * Files in use
   {{{
      fuser -v /mnt/home    << who is using file system
      fuser -km /mnt/home   << kill all actions on a filesystem
      mount -o remount,rw  /
      mount --bind /something /anotherthing

   }}}

 * NFS Filesystems    /etc/fstab , activated by /etc/init.d/netfs
   {{{
      mount -t nfs server1:/var/ftp/pub  /mnt/server1
      Line in /etc/fstab
      server1:/var/ftp/pub  /mnt/server1  nfs  defaults  0 0
   }}}
 * Automounter (autofs RPM) U5-P137
     /etc/auto.master:     << contains dir in fs, and yet another config file with further specific mount options.
       /misc   /etc/auto.misc
       /net    -hosts                 << -hosts allow browsing of nfs shares (could also use -g flag)
       /home/guests /etc/auto.home.guests
       /-      /etc/auto.direct       << /- Allows auto.direct to mount anywhere in file-system

     /etc/auto.misc:
       server1  -ro,soft   server1:/var/ftp/pub
       or 
       cd   -fstype=iso9660,ro,nosuid,nodev  :/dev/cdrom

     /etc/auto.home.guests
       *   -fstype=nfs   server1:/home/guests/&   << Mounts nfs on server1 with same name as dir access local in /home/guests

 * Password
   * /etc/login.defs
   * modify user  with  # chage [opt] uname
   * groupadd -g 200 sales    (GID=200)
   * Add Group: # usermod -a -G sales joshua     ( without -a remove other groups)

 * Quota System
   1. Add to '''fstab''' entry '''usrquota''' or '''grpquota''', then mount -o remount /home
   1. crate quote db in top fs dir, # '''quotacheck -cug'''   (use quotacheck -c /home to update)
   1. Start or stop quotas, '''quotaon''', '''quotaoff'''
   1. Set quota # '''edquota USER 4096 5120 40 50 /foo'''
   1. Copy user1 policy to user2 # edquota -p user1 user2
   
  * SELinux (user:role:type:sensitivity:category)
    1. # chcon -t tmp_t /etc/hosts   << change security context.
    1. List all types # chcon --reference
    1. #restorecon /root/*
    * Modes Enforcing, Permissive, Disabled
      * /etc/sysconfig/selinux
      * system-config-securitylevel
      * getenforce and setenforce 0|1
      * GRUB selinux=0
 * NIS 
   * # yum install portmap
   * # '''getent''' passwd

 * tcp_wrappers
   1. check with # ldd EXE
   1. /etc/hosts.allow
         sshd: ALL EXCEPT .cracker.org  EXCEPT trusted.cracker.org
  
 * Samba
   {{{
   /etc/samba/smb.conf   << well commented.
   # testparm   << check syntax

   ads - Active Directory member, add with #net ads join -U Administrator

   encrypted passwords stored in  /etc/samba/passdb.tdb
   add user with # smbpasswd -a user
   modify # smbpasswd user
   User needs local account translated through /etc/samba/smbusers or '''winbindd''' service.

   smbclient -L ''hostname''    << view shares

   mount -t cifs //stationX  /mnt/samba -o user=Piet,dom=MyDomain,uid=500,file_mode=664

   }}}


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CategoryLinux