Differences between revisions 5 and 6

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
2. crate quote db in top fs dir, # quotacheck -cug (use quotacheck -c /home to update)
3. Start or stop quotas, quotaon, quotaoff
4. Set quota # edquota USER 4096 5120 40 50 /foo
5. 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.
  2. List all types # chcon --reference
  3. #restorecon /root/*
  4. Modes Enforcing, Permissive, Disabled
    - /etc/sysconfig/selinux
    - system-config-securitylevel
    - getenforce and setenforce 0|1
    - GRUB selinux=0
NIS
- # yum install portmap
- # getent passwd

...

CategoryLinux

-  ⇤ ← Revision 5 as of 2010-01-25 15:02:36 → 
  Size: 2383
  Editor: PieterSmit
  Comment:
+   ← Revision 6 as of 2010-01-26 10:17:55 → ⇥
  Size: 3402
  Editor: PieterSmit
  Comment:
-Deletions are marked like this.
+Additions are marked like this.
 Line 36:
+ * 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
   }}}
-Line 72:
+Line 79:
+ * 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