Monthly Archives: April 2013

install PPTP VPN on Gentoo server

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First, Install the necessary components

emerge -av ppp pptpd iptables

Note: PPP should be supported by Linux Kernel. If your Kernel doesn’t support PPP, you need to re-compile it.

Modify /etc/ppp/options.pptpd

nano /etc/ppp/options.pptpd

unmark below section and use google DNS

ms-dns 8.8.8.8
ms-dns 8.8.8.4

create username, password for VPN access, modify /etc/ppp/chap-secrets


# Secrets for authentication using CHAP
# client  server  secret          IP addresses
username * password *

Then modify system settings for IP forward.

nano /etc/pptpd.conf

Unmark below sections:

localip 192.168.0.1
remoteip 192.168.0.234-238,192.168.0.245

Then add ip forward rules, modify /etc/sysctl.conf and add

net.ipv4.ip_forward = 1

Save and execute

sysctl -p

Add iptable rules

iptables -t nat -A POSTROUTING -o eth0 -s 192.168.0.0/24 -j MASQUERADE
/etc/init.d/iptables save

Start iptable and pptp

/etc/init.d/iptables start
/etc/init.d/pptpd start

Start the service when system start

rc-update add iptables default
rc-update add pptpd default

use mysql event to maintenance Query Cache

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mysql>show variables like '%event%'; 

+---------------------------------------------------+-------+
| Variable_name                                     | Value |
+---------------------------------------------------+-------+
| event_scheduler                                   | OFF   |
| performance_schema_events_waits_history_long_size | 10000 |
| performance_schema_events_waits_history_size      | 10    |
+---------------------------------------------------+-------+

mysql>SET GLOBAL event_scheduler = 1;
mysql>use database;
mysql>CREATE EVENT flush_query_cache ON SCHEDULE EVERY 1 HOUR DO FLUSH QUERY CACHE;