Chapter 7 Troubleshooting - ZyXEL Communications APS 1.0 Administrator's Manual

Auto provisioning

Table of Contents

1 When I use Export DB as SPTGEN with 3DES, the system freezes up.

3DES is a very powerful encryption algorithm and requires a lot of CPU power. It is suggested

that you perform the function during an off-peak period or offline. It will be safer and won't

affect usage performance.

2 The hard disk storage is almost full.

Backup files will stay in the directory "home\apache2\hotdocs\PS\bkup\mysql\" unless

deleted or moved. The system Administrator should be responsible for managing these files.

When the hard disk storage approaches its limit, the system Administrator should archive

(move) the files to another location.

If there is still not enough space, you should expand your storage space by adding new

hardware.

3 Why is it suggested to disable the Linux firewall on this server?

It is better to have a dedicated firewall device. This allows the server to dedicate more

resources to the provisioning service.

4 Is there any solution to provide redundant databases?

MySQL supports one-way replication. One server acts as the master, while one or more other

servers act as slaves (refer to

binary log files and maintains an index of the files to keep track of log rotation. These logs

serve as a record of updates to be sent to slave servers. When a slave server connects to the

master server, it informs the master of its last position within the logs since the last

successfully propagated update. The slave gets any updates that have occurred since then, and

then blocks and waits for the master to notify it of new updates.

A slave server can also serve as a master if you want to set up chained replication servers.

Note that when you are using replication, all updates to the tables that are replicated should be

performed on the master server. Otherwise, you must always be careful to avoid conflicts

between updates that users make to tables on the master and updates that they make to tables

on the slave.

One-way replication has benefits for robustness, speed, and system administration:

• Robustness is increased with a master/slave setup. In the event of problems with the

master, you can switch to the slave as a backup.