Intermittent "Can't Connect To MySQL Server"
I started getting small periods of intermittent connection errors about once every hour, lasting for about 1 to 5 minutes each time:
Can't connect to local MySQL server through socket
'/var/lib/mysql/mysql.sock'
I enabled the error log and did some other monitoring and established 2 things:
- the server doesn't crash/restart, it keeps running throughout the errors
- the errors do not match the load on the website, as sometimes when 500 users are online there are no errors, but when 300 are online they may by prolific
I checked many forums and then made 5 changes:
- changed the directory containing the mysql.sock file so only file owners or superusers can delete files from it
- I changed the default socket file setting in both my.cnf and php.ini
- I read about SELinux causing such a problem, so I disabled SELinux completely, rebooted the server and double-checked that it is indeed disabled.
- I changed the maximum amount of open files allowed by the operating system from 1024 to 30000.
Despite all these changes, I still get the errors. I then read that there is a workaround by using TCP/IP instead of the sock file. I tried that, but I still get the error intermittently in the form of:
Can't connect to MySQL server on 127.0.0.1
MySQL server 4.1.20, PHP 4.3.9, client API 4.1.20, CentOS 4.3, Intel P4 2.8GHz 1GB RAM
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The default is 100. connections 100 # TAG: localip # TAG: remoteip # Specifies the local and remote IP address ranges. # # These options are ignored if delegate option is set. # # Any addresses work as long as the local machine takes care of the # routing. But if you want to use MS-Windows networking, you should # use IP addresses out of the LAN address space and use the proxyarp # option in the pppd options file, or run bcrelay. # # You can specify single IP addresses seperated by commas or you can # specify ranges, or both. For example: # # 192.168.0.234,192.168.0.245-249,192.168.0.254 # # IMPORTANT RESTRICTIONS: # # 1. No spaces are permitted between commas or within addresses. # # 2. If you give more IP addresses than the value of connections, # it will start at the beginning of the list and go until it # gets connections IPs. Others will be ignored. # # 3. No shortcuts in ranges! ie. 234-8 does not mean 234 to 238, # you must type 234-238 if you mean this. # # 4. If you give a single localIP, that's ok - all local IPs will # be set to the given one. You MUST still give at least one remote # IP for each simultaneous client. # # (Recommended) localip 192.168.11.200 remoteip 192.168.11.100-199 # or #localip 192.168.0.234-238,192.168.0.245 #remoteip 192.168.1.234-238,192.168.1.245 Code: [root@* ~]# cat /etc/ppp/options.pptpd ########################################## # $Id: options.pptpd,v 1.11 2005/12/29 01:21:09 quozl Exp $ # # Sample Poptop PPP options file /etc/ppp/options.pptpd # Options used by PPP when a connection arrives from a client. # This file is pointed to by /etc/pptpd.conf option keyword. # Changes are effective on the next connection. See "man pppd". # # You are expected to change this file to suit your system. As # packaged, it requires PPP 2.4.2 and the kernel MPPE module. ######################################### # Authentication # Name of the local system for authentication purposes # (must match the second field in /etc/ppp/chap-secrets entries) name pptpd # Strip the domain prefix from the username before authentication. # (applies if you use pppd with chapms-strip-domain patch) #chapms-strip-domain # Encryption # (There have been multiple versions of PPP with encryption support, # choose with of the following sections you will use.) # BSD licensed ppp-2.4.2 upstream with MPPE only, kernel module ppp_mppe.o # {{{ refuse-pap refuse-chap refuse-mschap # Require the peer to authenticate itself using MS-CHAPv2 [Microsoft # Challenge Handshake Authentication Protocol, Version 2] authentication. require-mschap-v2 # Require MPPE 128-bit encryption # (note that MPPE requires the use of MSCHAP-V2 during authentication) require-mppe-128 # }}} # OpenSSL licensed ppp-2.4.1 fork with MPPE only, kernel module mppe.o # {{{ #-chap #-chapms # Require the peer to authenticate itself using MS-CHAPv2 [Microsoft # Challenge Handshake Authentication Protocol, Version 2] authentication. #+chapms-v2 # Require MPPE encryption # (note that MPPE requires the use of MSCHAP-V2 during authentication) #mppe-40 # enable either 40-bit or 128-bit, not both #mppe-128 #mppe-stateless # }}} # Network and Routing # If pppd is acting as a server for Microsoft Windows clients, this # option allows pppd to supply one or two DNS (Domain Name Server) # addresses to the clients. 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