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Useless services in CentOS VDS/VPS

This is a discussion on Useless services in CentOS VDS/VPS within the Web servers forums, part of the Mastering Servers category; I'm trying to minimize memory and CPU usage on my VPS. here's what I really need in init.d: crond firewall ...


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  #1 (permalink)  
Old 05-23-2007, 07:20 PM
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Default Useless services in CentOS VDS/VPS
I'm trying to minimize memory and CPU usage on my VPS.
here's what I really need in init.d:

crond
firewall
httpd
postfix
dovecot
clamd
clamsmtpd
named
network
sshd
syslog
vsftpd
webmin
xinetd
/etc/rc.d/rc.local

And this is my pstree output:

Code:
init-+-clamd
     |-clamsmtpd
     |-crond
     |-dbus-daemon-1
     |-dovecot-+-dovecot-auth
     |         |-imap-login
     |         |-imap-login
     |         |-imap-login
     |         |-imap-login
     |         |-pop3-login
     |         |-pop3-login
     |         |-pop3-login
     |         `-pop3-login
     |-httpd-+-httpd
     |       |-httpd
     |       |-httpd---pstree
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       |-httpd
     |       `-httpd
     |-master-+-anvil
     |        |-pickup
     |        |-qmgr
     |        |-smtpd
     |        |-smtpd
     |        `-trivial-rewrite
     |-miniserv.pl
     |-miniserv.pl---miniserv.pl
     |-miniserv.pl---miniserv.pl
     |-miniserv.pl---miniserv.pl
     |-miniserv.pl---miniserv.pl
     |-sshd---sshd---bash---mc---bash
     |-syslogd
     `-xinetd
Now I see a lot of stuff in /etc/rc.d/init.d
but I'm not sure if I can safely move it out:

auditd
dc_client
haldaemon
kudzu
netplugd
rdisc
dc_server
halt
lm_sensors
saslauthd
vzquota
messagebus
nscd
smartd
cpuspeed
irqbalance
microcode_ctl
functions
killall
netfs
rawdevices

Is there somebody using a VPS under virtuozzo who can tell me which of all the services I can switch off/remove ?

Also, what exactly happens when I do a reboot in a VPS? When I do
# shutdown -r now
it used to show me it was stopping and starting all services in messages log,
but all I get now is just 1 entry where it says I did a shutdown.
It looks like shutdown is broken somehow. Any idea?
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  #2 (permalink)  
Old 05-23-2007, 10:02 PM
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VPS/VDS are not actual server they are are virtual thingy, so you cannot shutdown it using shutdown command. You can reboot the vps or kill vps from host server only using CP. So when you type shutdown command it will just kill all running services and restart everything again.

Most of these services needed to run different apps. You can disable following services as those are not used by VPS:
auditd
kudzu
rdisc
dc_server
lm_sensors
smartd
cpuspeed
irqbalance
microcode_ctl

Use ntsysv to disable above services. Mostly they may be in disabled state.

If you use Plesk/Cpanel then don't play much at OS level it will break something somewhere. If it is a plain VPS then you can modify services.
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  #3 (permalink)  
Old 05-24-2007, 12:15 AM
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OK, so now I have it set like this:
Code:
clamd 	Yes 	 Clam AntiVirus Daemon is a TCP/IP or socket protocol server.
clamsmtpd 	Yes 	clamav antivirus internal exchange with postfix
crond 	Yes 	cron is a standard UNIX program that runs user-specified programs at periodic scheduled times. vixie cron adds a number of features to the basic UNIX cron, including better security and more powerful configuration options.
dc_client 	No 	Distcache is a Distributed SSL Session Cache Client Proxy.
dovecot 	Yes 	Dovecot Imap Server
firewall 	Yes 	My iptables interface script 2007
haldaemon 	Yes 	This is a daemon for collecting and maintaing information about hardware from several sources. See http://www.freedesktop.org/Software/hal
halt 	No 	
httpd 	Yes 	Apache is a World Wide Web server. It is used to serve HTML files and CGI.
killall 	No 	
messagebus 	Yes 	This is a daemon which broadcasts notifications of system events and other messages. See http://www.freedesktop.org/software/dbus/
netfs 	No 	Mounts and unmounts all Network File System (NFS), SMB/CIFS (Lan Manager/Windows), and NCP (NetWare) mount points.
network 	Yes 	Activates/Deactivates all network interfaces configured to start at boot time.
nscd 	No 	This is a daemon which handles passwd and group lookups for running programs and cache the results for the next query. You should start this daemon if you use slow naming services like NIS, NIS+, LDAP, or hesiod.
postfix 	Yes 	Postfix is a Mail Transport Agent, which is the program that moves mail from one machine to another.
rawdevices 	Yes 	This scripts assignes raw devices to block devices (such as hard drive partitions). This is for the use of applications such as Oracle. You can set up the raw device to block device mapping by editing the file /etc/sysconfig/rawdevices. Note that the use of raw devices is deprecated, and applications should open regular block devices with O_DIRECT instead.
saslauthd 	Yes 	saslauthd is a server process which handles plaintext authentication requests on behalf of the cyrus-sasl library.
sshd 	Yes 	OpenSSH server daemon
syslog 	Yes 	Syslog is the facility by which many daemons use to log messages to various system log files. It is a good idea to always run syslog.
vsftpd 	No 	Vsftpd is a ftp daemon, which is the program that answers incoming ftp service requests.
webmin 	Yes 	Start/stop Webmin
xinetd 	Yes 	xinetd is a powerful replacement for inetd. xinetd has access control mechanisms, extensive logging capabilities, the ability to make services available based on time, and can place limits on the number of servers that can be started, among other things.
The only ones not started at boot are:
halt
killall
netfs
nscd
dc_client
vsftpd

vsftpd is the only one I deliberately disabled booting for. The rest is probably useless on a VDS too..

And here's what messages log now says for a reboot (I fixed it using vzreboot with some help from my hoster, and it actually reboots with shutdown -r now, takes about 20 second:
Code:
May 23 19:56:16 new shutdown: shutting down for system reboot
May 23 19:56:16 new init: Switching to runlevel: 6
May 23 19:56:16 new haldaemon: haldaemon shutdown failed
May 23 19:56:16 new messagebus: messagebus -TERM succeeded
May 23 19:56:16 new saslauthd[8017]: server_exit     : master exited: 8017
May 23 19:56:16 new saslauthd: saslauthd shutdown succeeded
May 23 19:56:16 new webmin: Stopping Webmin server in /usr/libexec/webmin
May 23 19:56:16 new rc: Stopping webmin:  succeeded
May 23 19:56:16 new httpd: httpd shutdown succeeded
May 23 19:56:16 new sshd: sshd -TERM succeeded
May 23 19:56:16 new postfix: Shutting down postfix: 
May 23 19:56:16 new postfix:  succeeded
May 23 19:56:16 new postfix: 
May 23 19:56:17 new rc: Stopping postfix:  succeeded
May 23 19:56:17 new dovecot: dovecot shutdown succeeded
May 23 19:56:17 new clamsmtpd: clamsmtpd shutdown succeeded
May 23 19:56:17 new clamd: clamd shutdown succeeded
May 23 19:56:17 new xinetd[7891]: Exiting...
May 23 19:56:17 new xinetd: xinetd shutdown succeeded
May 23 19:56:17 new crond: crond shutdown succeeded
May 23 19:56:17 new syslog: klogd succeeded
May 23 19:56:17 new exiting on signal 15
May 23 19:56:29 new syslogd 1.4.1: restart.
May 23 19:56:29 new syslog: syslogd startup succeeded
May 23 19:56:29 new syslog: klogd succeeded
May 23 19:56:29 new rc: Starting firewall:  succeeded
May 23 19:56:29 new sshd:  succeeded
May 23 19:56:29 new xinetd[11669]: xinetd Version 2.3.13 started with libwrap loadavg options compiled in.
May 23 19:56:29 new xinetd[11669]: Started working: 0 available services
May 23 19:56:29 new xinetd: xinetd startup succeeded
May 23 19:56:29 new clamd: Running as user clamav (UID 100, GID 101)
May 23 19:56:29 new clamd: clamd startup succeeded
May 23 19:56:29 new clamsmtpd: clamsmtpd startup succeeded
May 23 19:56:29 new dovecot: dovecot startup succeeded
May 23 19:56:30 new postfix:  succeeded
May 23 19:56:31 new httpd: httpd startup succeeded
May 23 19:56:31 new crond: crond startup succeeded
May 23 19:56:28 new rc.sysinit: -e 
May 23 19:56:28 new sysctl: net.ipv4.ip_forward = 0 
May 23 19:56:28 new rc.sysinit: Configuring kernel parameters:  succeeded 
May 23 19:56:28 new date: Wed May 23 19:56:28 CEST 2007 
May 23 19:56:28 new rc.sysinit: Setting clock : Wed May 23 19:56:28 CEST 2007 succeeded 
May 23 19:56:28 new rc.sysinit: Setting hostname xxxxx.net:  succeeded 
May 23 19:56:28 new mount: mount: none already mounted or /dev/pts busy 
May 23 19:56:28 new rc.sysinit: Mounting local filesystems:  failed 
May 23 19:56:28 new mount: mount: according to mtab, devpts is already mounted on /dev/pts 
May 23 19:56:28 new rc.sysinit: Enabling local filesystem quotas:  succeeded 
May 23 19:56:28 new rc.sysinit: Enabling swap space:  succeeded 
May 23 19:56:28 new init: Entering runlevel: 3 
May 23 19:56:31 new saslauthd[11799]: detach_tty      : master pid is: 11799
May 23 19:56:28 new sysctl: net.ipv4.ip_forward = 0 
May 23 19:56:31 new saslauthd: saslauthd startup succeeded
May 23 19:56:31 new saslauthd[11799]: ipc_init        : listening on socket: /var/run/saslauthd/mux
May 23 19:56:28 new network: Setting network parameters:  succeeded 
May 23 19:56:29 new network: Bringing up loopback interface:  succeeded 
May 23 19:56:32 new messagebus: messagebus startup succeeded
May 23 19:56:29 new ifup: SIOCADDRT: Network is unreachable 
May 23 19:56:29 new ifup: SIOCADDRT: Network is unreachable 
May 23 19:56:32 new haldaemon: haldaemon startup succeeded
May 23 19:56:29 new ifup: SIOCADDRT: Network is unreachable 
May 23 19:56:29 new network: Bringing up interface venet0:  succeeded 
May 23 19:56:32 new webmin(pam_unix)[11835]: authentication failure; logname= uid=0 euid=0 tty= ruser= rhost=  user=root
May 23 19:56:34 new rc: Starting webmin:  succeeded
May 23 19:56:34 new init: no more processes left in this runlevel
May 23 19:57:05 new sshd(pam_unix)[11854]: session opened for user
Any idea on getting the bold ones out?

All is working fine, so it's not really important, but I just like clean logs.
I googled some on those two, but there's not much I can go on.
Last edited by meowing; 05-24-2007 at 12:20 AM.
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  #4 (permalink)  
Old 05-24-2007, 02:11 AM
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May be netfs (for mounting network f I see you can login as root, so network is working fine just turn on netfs
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Old 05-24-2007, 04:25 PM
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I tried chkconfig --levels 235 netfs on
but it did not influence the bold entries.

And I actually disabled root-login for ssh.
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  #6 (permalink)  
Old 05-24-2007, 04:33 PM
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Here is my VPS info; it runs FC4 and I've no error, it runs
Code:
crond           0:off   1:off   2:on    3:on    4:on    5:on    6:off
dc_client       0:off   1:off   2:off   3:off   4:off   5:off   6:off
dc_server       0:off   1:off   2:off   3:off   4:off   5:off   6:off
gpm             0:off   1:off   2:on    3:off   4:on    5:on    6:off
iptables        0:off   1:off   2:on    3:on    4:on    5:on    6:off
lighttpd        0:off   1:off   2:on    3:on    4:on    5:on    6:off
lm_sensors      0:off   1:off   2:on    3:off   4:on    5:on    6:off
messagebus      0:off   1:off   2:off   3:off   4:on    5:on    6:off
monit           0:off   1:off   2:off   3:off   4:off   5:off   6:off
named           0:off   1:off   2:off   3:off   4:off   5:off   6:off
netfs           0:off   1:off   2:off   3:off   4:on    5:on    6:off
netplugd        0:off   1:off   2:off   3:off   4:off   5:off   6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
mysqld          0:off   1:off   2:off   3:on    4:off   5:off   6:off
httpd           0:off   1:off   2:off   3:on    4:off   5:off   6:off
nscd            0:off   1:off   2:off   3:off   4:off   5:off   6:off
portmap         0:off   1:off   2:off   3:off   4:on    5:on    6:off
postfix         0:off   1:off   2:on    3:on    4:on    5:on    6:off
rdisc           0:off   1:off   2:off   3:off   4:off   5:off   6:off
saslauthd       0:off   1:off   2:off   3:on    4:off   5:off   6:off
smb             0:off   1:off   2:off   3:off   4:off   5:off   6:off
snmpd           0:off   1:off   2:off   3:off   4:off   5:off   6:off
snmptrapd       0:off   1:off   2:off   3:off   4:off   5:off   6:off
squid           0:off   1:off   2:off   3:off   4:off   5:off   6:off
sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
syslog          0:off   1:off   2:on    3:on    4:on    5:on    6:off
winbind         0:off   1:off   2:off   3:off   4:off   5:off   6:off
xinetd          0:off   1:off   2:off   3:on    4:on    5:on    6:off
yum             0:off   1:off   2:off   3:off   4:off   5:off   6:off

xinetd based services:
        chargen:        off
        chargen-udp:    off
        daytime:        off
        daytime-udp:    off
        echo:           off
        echo-udp:       off
        finger:         off
        ntalk:          off
        rsync:          off
        swat:           off
        talk:           off
        time:           off
        time-udp:       off
Hope this helps

Quote:
I tried chkconfig --levels 235 netfs on
but it did not influence the bold entries.
try
Code:
chkconfig netfs on
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  #7 (permalink)  
Old 06-02-2007, 05:34 PM
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You have

netfs 0:off 1:off 2:off 3:off 4:on 5:on 6:off

so yours would actually have been:
# chkconfig --level 45 netfs on

netfs had no influence on the errors in messages log for me.
Could you post your messages log, the part when it's starting up?

I have these set in my CentOS 4.5 now, and all is fine with the VPS:
Code:
# chkconfig --list
haldaemon       0:off   1:off   2:on    3:on    4:on    5:on    6:off
firewall        0:off   1:off   2:on    3:on    4:on    5:on    6:off
clamd           0:off   1:off   2:on    3:on    4:on    5:on    6:off
clamsmtpd       0:off   1:off   2:on    3:on    4:on    5:on    6:off
nscd            0:off   1:off   2:off   3:off   4:off   5:off   6:off
webmin          0:off   1:off   2:on    3:on    4:off   5:on    6:off
syslog          0:off   1:off   2:on    3:on    4:on    5:on    6:off
dovecot         0:off   1:off   2:on    3:on    4:on    5:on    6:off
network         0:off   1:off   2:on    3:on    4:on    5:on    6:off
rawdevices      0:off   1:off   2:on    3:on    4:on    5:on    6:off
xinetd          0:off   1:off   2:off   3:on    4:on    5:on    6:off
postfix         0:off   1:off   2:on    3:on    4:on    5:on    6:off
messagebus      0:off   1:off   2:on    3:on    4:on    5:on    6:off
saslauthd       0:off   1:off   2:off   3:on    4:off   5:off   6:off
sshd            0:off   1:off   2:on    3:on    4:on    5:on    6:off
crond           0:off   1:off   2:on    3:on    4:on    5:on    6:off
dc_client       0:off   1:off   2:off   3:off   4:off   5:off   6:off
httpd           0:off   1:off   2:off   3:on    4:off   5:off   6:off
vsftpd          0:off   1:off   2:off   3:off   4:off   5:off   6:off
xinetd based services:
        chargen-udp:    off
        rsync:  off
        chargen:        off
        daytime-udp:    off
        daytime:        off
        echo-udp:       off
        echo:   off
        time-udp:       off
        time:   off
        ntalk:  off
        talk:   off
        finger: off
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