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Operating Systems Linux Red Hat Network becomes slow and return fast only after restart network Post 302895303 by moshesa on Monday 31st of March 2014 05:59:38 AM
Old 03-31-2014
Network becomes slow and return fast only after restart network

Hi,
I have 2 machines in production environment:
1. redhat machine for application
2. DB machine (oracle)

The application doing a lot of small read&writes from and to the DB machine.

The problem is that after some few hours the network from the application to the DB becomes very slow and it returns to the normal only after:
Code:
service network restart

Before:
Code:
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=1 ttl=63 time=7.81 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=2 ttl=63 time=5.88 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=3 ttl=63 time=7.81 ms

After restart network:
Code:
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=84 ttl=63 time=0.135 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=85 ttl=63 time=0.171 ms
64 bytes from hostname.domain (xxx.xxx.xxx.xxx): icmp_seq=86 ttl=63 time=0.153 ms

What can it be?
How can i solve this strange behavior?

Thanks.
 

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pure-authd(8)							     Pure-FTPd							     pure-authd(8)

NAME
pure-authd - External authentication agent for Pure-FTPd. SYNTAX
pure-authd [-p </path/to/pidfile>] [-u uid] [-g gid] [-B] <-s /path/to/socket> -r /program/to/run DESCRIPTION
pure-authd is a daemon that forks an authentication program, waits for an authentication reply, and feed them to an application server. pure-authd listens to a local Unix socket. A new connection to that socket should feed pure-authd the following structure : account:xxx password:xxx localhost:xxx localport:xxx peer:xxx end (replace xxx with appropriate values) . localhost, localport and peer are numeric IP addresses and ports. peer is the IP address of the remote client. These arguments are passed to the authentication program, as environment variables : AUTHD_ACCOUNT AUTHD_PASSWORD AUTHD_LOCAL_IP AUTHD_LOCAL_PORT AUTHD_REMOTE_IP AUTHD_ENCRYPTED The authentication program should take appropriate actions to fetch account info according to these arguments, and reply to the standard output a structure like the following one : auth_ok:1 uid:42 gid:21 dir:/home/j end auth_ok:xxx If xxx is 0, the user was not found (the next authentication method passed to pure-ftpd will be tried) . If xxx is -1, the user was found, but there was a fatal authentication error : user is root, password is wrong, account has expired, etc (next authentication methods will not be tried) . If xxx is 1, the user was found and successfully authenticated. uid:xxx The system uid to be assigned to that user. Must be > 0. gid:xxx The primary system gid. Must be > 0. dir:xxx The absolute path to the home directory. Can contain /./ for a chroot jail. slow_tilde_expansion:xxx (optional, default is 1) When the command 'cd ~user' is issued, it's handy to go to that user's home directory, as expected in a shell environment. But fetching account info can be an expensive operation for non-system accounts. If xxx is 0, 'cd ~user' will expand to the system user home directory. If xxx is 1, 'cd ~user' won't expand. You should use 1 in most cases with external authentication, when your FTP users don't match system users. You can also set xxx to 1 if you're using slow nss_* system authentication modules. throttling_bandwidth_ul:xxx (optional) The allocated bandwidth for uploads, in bytes per second. throttling_bandwidth_dl:xxx (optional) The allocated bandwidth for downloads, in bytes per second. user_quota_size:xxx (optional) The maximal total size for this account, in bytes. user_quota_files:xxx (optional) The maximal number of files for this account. ratio_upload:xxx (optional) radio_download:xxx (optional) The user must match a ratio_upload:ratio_download ratio. Only one authentication program is forked at a time. It must return quickly. OPTIONS
-u <uid> Have the daemon run with that uid. -g <gid> Have the daemon run with that gid. -B Fork in background (daemonization). -s </path/to/socket> Set the full path to the local Unix socket. -R </path/to/program> Set the full path to the authentication program. -h Output help information and exit. EXAMPLES
To run this program the standard way type: pure-authd -s /var/run/ftpd.sock -r /usr/bin/my-auth-program & pure-ftpd -lextauth:/var/run/ftpd.sock & /usr/bin/my-auth-program can be as simple as : #! /bin/sh echo 'auth_ok:1' echo 'uid:42' echo 'gid:21' echo 'dir:/home/j' echo 'end' AUTHORS
Frank DENIS <j at pureftpd dot org> SEE ALSO
ftp(1), pure-ftpd(8) pure-ftpwho(8) pure-mrtginfo(8) pure-uploadscript(8) pure-statsdecode(8) pure-pw(8) pure-quotacheck(8) pure-authd(8) RFC 959, RFC 2389, RFC 2228 and RFC 2428. Pure-FTPd team 1.0.36 pure-authd(8)
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