1. Web -- https + Load balancer
2. Security -- Vyatta/iptables firewalls
3. application -- Appache/Tomcat/Workflow/adapter + round robin cluster
4. DB server -- Active->passive cluster in MySQL/PostgreSQL
5. system monitoring -- Opennms/Nagios
6. Virtualization -- Xen or VMWare
7. Linux Storage -- iSCSI/NAS
8. Client access -- putty/xmanager/.....
9. Backup -- Clonezilla, Acronis, NBU,....
9. Shell scripts -- Automation, backup, restore
Ansible
http://en.wikipedia.org/wiki/Comparison_of_open-source_configuration_management_software
Moodle 修改 作業附加檔案的最大值
http://moodle.tw/moodle/mod/forum/discuss.php?d=858
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