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

• 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)

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CategoryLinux