Migrating From CentOS-6 To CentOS-7

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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 are:

/boot        1GB

/                 6GB

/home        4GB

/opt            4GB

/tmp            2GB

/usr             12GB

/usr/local    2GB

/var              8GB

swap            16GB

Plus many other file system dedicated to specific applications and data.

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.

Is there some detailed installation instructions showing some advanced methods?

TIA

Gene


Eugene Poole Woodstock, Georgia

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

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