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=====CRM manual  Putting cluster in maintenance mode for a maintenance activity on the SAP servers.
Many times there will be a need to do some kind of maintenance of a SAP server like OS patching, kernel upgrade, SID stacking etc.

In cases like these you might need to restart the servers but if the servers/nodes are in the cluster then the pacemaker will start migrating the services which can create a setback for the administrators. To avoid such scenarios we can simply put the cluster or a particular node in maintenance mode to avoid unwanted resource migrations.

There are three ways to achieve this depending on the situation.

Put the cluster in maintenance mode
crm configure property maintenance-mode="true"
Put the node in maintenance mode
crm node maintenance <node>
Put the node in standby mode
crm node standby <node>

==Once the activity is completed move the cluster or node out of maintenance using below commands.

Move the cluster out of maintenance
crm configure property maintenance-mode="false"
Move the node out of maintenance
crm node ready <node>
Move the node out of standby
crm node online <node>

====Most Important Commands for managing a pacemaker cluster

CRM monitoring commands-

-> crm status : Check the status of the cluster and its services.
-> crm_mon    : Live nonitoring of the cluster

CRM Node Commands

-> crm node show                : list the nodes in the cluster.
-> crm node standby <node name> : put a node on standby
-> crm node fence <node name>   : fence a particular node. (Restart)
-> crm node online <node name>  : bring a node online after standby.
-> crm node clearstate <node>   : clear a nodes state. (if in error)
-> crm node maintenance <node>  : put the node in maintenance mode. Will not affect the cluster services or resources
-> crm node ready <node>        : put the node out of maintenance

CRM Cluster Commands

-> crm cluster health           : Check the health of the cluster.
-> crm cluster start            : Start cluster services on the node.
-> crm cluster stop             : Stop cluster services on the node.
-> crm cluster restart          : Restart cluster services on the node.
-> crm cluster status           : Show cluster services on this node.

CRM Resource Commands

-> crm resource status <name>   : Check status of the resource
-> crm resource start <name>    : Start the resource.
-> crm resource stop  <name>    : Stop the resource.
-> crm resource cleanup <name>  : Cleanup the resource.(if in error)
-> crm resource migrate <name> <node> : Migrate the resource from this node to another.

==special thank you
https://www.linkedin.com/pulse/everything-you-need-know-sap-pacemaker-cluster-testing-robin-singh/

If your server requires a new server IP due to server move, or network restructuring, follow the following steps to update your license and system.

1) Contact DirectAdmin ahead of the move to notify them of the new IP address.  Include the old IP, and license ID.  Note that if you have an internal license, you must be the datacenter to make this request.  If you cannot view your license from your clients section then you do not have authority to issue the request.   Note that DirectAdmin will continue to run even after we change the IP.  You just can't update the license or DA at this time.  Also ensure you have enough time before the license expires (eg: more than a day).

2) Boot the server with the new server ip.  Do this the same way you did originally for the old server IP.  This should be done in your system's network settings and not in DirectAdmin (yet).  Do not add the IP to DA through the IP Manager.

DirectAdmin will not be running, as the license file will be invalid.

Assuming we got your email and processed the request in step 1), you should now be able to get the new license file:

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I wish to automate new DMARC records for all new domains
https://help.directadmin.com/item.php?id=596

If you like the above setup, and you want to automate it's addition to all new dns zones, you can run the following:
cd /usr/local/directadmin/data/templates/custom
cp ../dns_txt.conf .

and then add the record you want to the bottom of the custom/dns_txt.conf by running this command:
echo '_dmarc="v=DMARC1; p=none; sp=none; rua=mailto:spam-reports@|DOMAIN|"' >> dns_txt.conf

keeping in mind that this assumes you've got a spam-reports account created already.
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Ext2

    * Ext2 stands for second extended file system.
    * It was introduced in 1993. Developed by Rémy Card.
    * This was developed to overcome the limitation of the original ext file system.
    * Ext2 does not have journaling feature.
    * On flash drives, usb drives, ext2 is recommended, as it doesn’t need to do the over head of journaling.
    * Maximum individual file size can be from 16 GB to 2 TB
    * Overall ext2 file system size can be from 2 TB to 32 TB

Ext3

    * Ext3 stands for third extended file system.
    * It was introduced in 2001. Developed by Stephen Tweedie.
    * Starting from Linux Kernel 2.4.15 ext3 was available.
    * The main benefit of ext3 is that it allows journaling.
    * Journaling has a dedicated area in the file system, where all the changes are tracked. When the system crashes, the possibility of file system corruption is less because of journaling.
    * Maximum individual file size can be from 16 GB to 2 TB
    * Overall ext3 file system size can be from 2 TB to 32 TB
    * There are three types of journaling available in ext3 file system.
          o Journal – Metadata and content are saved in the journal.
          o Ordered – Only metadata is saved in the journal. Metadata are journaled only after writing the content to disk. This is the default.
          o Writeback – Only metadata is saved in the journal. Metadata might be journaled either before or after the content is written to the disk.
    * You can convert a ext2 file system to ext3 file system directly (without backup/restore).

Ext4

    * Ext4 stands for fourth extended file system.
    * It was introduced in 2008.
    * Starting from Linux Kernel 2.6.19 ext4 was available.
    * Supports huge individual file size and overall file system size.
    * Maximum individual file size can be from 16 GB to 16 TB
    * Overall maximum ext4 file system size is 1 EB (exabyte). 1 EB = 1024 PB (petabyte). 1 PB = 1024 TB (terabyte).
    * Directory can contain a maximum of 64,000 subdirectories (as opposed to 32,000 in ext3)
    * You can also mount an existing ext3 fs as ext4 fs (without having to upgrade it).
    * Several other new features are introduced in ext4: multiblock allocation, delayed allocation, journal checksum. fast fsck, etc. All you need to know is that these new features have improved the performance and reliability of the filesystem when compared to ext3.
    * In ext4, you also have the option of turning the journaling feature “off”.

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