| 5.14.3. Performing Maintenance on an Entire Dataservice | ||
|---|---|---|
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To perform maintenance on all of the machines within a dataservice, a rolling sequence of maintenance must be performed carefully on each machine in a structured way. In brief, the sequence is as follows
Perform maintenance on each of the current slaves
Switch the master to one of the already maintained slaves
Perform maintenance on the old master (now in slave state)
Switch the old master back to be the master again
A more detailed sequence of steps, including the status of each datasource in the dataservice, and the commands to be performed, is shown in the table below. The table assumes a three-node dataservice (one master, two slaves), but the same principles can be applied to any master/slave dataservice:
| Step | Description | Command | host1 | host2 | host3 |
|---|---|---|---|---|---|
| 1 | Initial state | Master | Slave | Slave | |
| 2 | Set maintenance policy | set policy maintenance | Master | Slave | Slave |
| 3 |
Shun slave host2
| datasource host2 shun | Master | Shunned | Slave |
| 4 | Perform maintenance | Master | Shunned | Slave | |
| 5 |
Validate the host2 server
configuration
| tpm validate | Master | Shunned | Slave |
| 6 |
Recover the slave host2
back
| datasource host2 recover | Master | Slave | Slave |
| 7 |
Ensure the slave ( host2 )
has caught up
| Master | Slave | Slave | |
| 8 |
Shun slave host3
| datasource host3 shun | Master | Slave | Shunned |
| 9 | Perform maintenance | Master | Slave | Shunned | |
| 10 |
Validate the host3 server
configuration
| tpm validate | Master | Slave | Shunned |
| 11 |
Recover slave host3 back
| datasource host3 recover | Master | Slave | Slave |
| 12 |
Ensure the slave ( host3 )
has caught up
| Master | Slave | Slave | |
| 13 |
Switch master to host2
| switch to host2 | Slave | Master | Slave |
| 14 |
Shun host1
| datasource host1 shun | Shunned | Master | Slave |
| 15 | Perform maintenance | Shunned | Master | Slave | |
| 16 |
Validate the host1 server
configuration
| tpm validate | Shunned | Master | Slave |
| 17 |
Recover the slave host1
back
| datasource host1 recover | Slave | Master | Slave |
| 18 |
Ensure the slave ( host1 )
has caught up
| Master | Slave | Slave | |
| 19 |
Switch master back to
host1
| switch to host1 | Master | Slave | Slave |
| 20 | Set automatic policy | set policy automatic | Master | Slave | Slave |