One thought on - Migrating From CentOS-6 To CentOS-7

• I asked this in Vol 154, Issue 29:

  I’ve a system that has been running CentOS 6 64-bit for almost
  4-years and I want to start the move to CentOS 7 64-bit.

  I run software RAID-1 with LVM everywhere except /boot which is a
  standard partition RAID-1.

  There are 2 areas that concern me greatly about this migration:

  1. How do I duplicate my current grub configuration file that
  supports a failure of /dev/sda to grub2?

  2. How do I install CentOS 7 but use my existing hard drive layout
  so I only format specific OS file systems. My drive layout goes back
  to the original proposed FHS layout. The separate partitions related
  to the operating system are:

  /boot        1GB  (standard boot as defined in fstab is /dev/md0)

  The following file systems are all defined in volume group
  vg_jpdopsys (size is 64 GB)

  / (root)      6GB

  /home       4GB

  /opt           4GB

  /tmp          2GB

  /usr            12GB

  /usr/local  2GB

  /var            8GB

  The following file system is defined in volume group vg_jpdswap
  (size is 24 GB)

  swap          16GB

  Plus many other file system dedicated to specific applications and
  data all using logical volume management.

  When I moved from CentOS 5 to CentOS 6 all of the OS partitions were
  formatted except /home.  All went extremely well then.

  But I don’t see a way to do that with CentOS 7 retaining the
  existing disk configuration.

  Is there some detailed installation instructions showing some
  advanced methods?

  TIA

  Gene

  If you saw the original post you will see that I did clean it up a bit. 
  I’m starting this move now understanding that I have until 2020 to do it.

  Any suggestions?

  TIA

  Gene

  —
  Eugene Poole Woodstock, Georgia