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Install
root@cmlin03:/# yum install net-snmp-utils
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Backup original config
joe@cmlin03:/etc/snmp# sudo mv /etc/snmp/snmpd.conf /etc/snmp/snmpd.conf.orig
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Create new config
joe@cmlin03:/etc/snmp# sudo vi /etc/snmp/snmpd.conf rocommunity mycommunity syslocation "office rack, large server" syscontact joe@smithinc.com
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Configure iptables to allow snmp connections
sudo vi /etc/sysconfig/iptables -A INPUT -p tcp --dport 161 -j ACCEPT -A INPUT -p udp --dport 161 -j ACCEPT
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Start the service
/etc/init.d/snmpd start
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Test
joe@cmlin02:/etc/snmp# snmpwalk -v 1 -c mycommunity -O e localhost
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Configure to start snmpd on boot
joe@cmlin02:/etc/snmp# sudo chkconfig snmpd on
Tag Archives: centos
CentOS 6 – Enable logging for OpenLDAP
[root@cmlin02 openldap]# vi /etc/rsyslog.conf ... # LDAP local4.* /var/log/ldap.log ...
[root@cmlin02 openldap]# /etc/init.d/rsyslog restart Shutting down system logger: [ OK ] Starting system logger: [ OK ] [root@cmlin02 openldap]#
[root@cmlin02 openldap]# touch /var/log/ldap.log
[root@cmlin02 openldap]# service slapd restart
[root@cmlin02 log]# tail -100f /var/log/ldap.log ... Jul 25 10:43:24 cmlin02 slapd[10271]: conn=1019 op=196 SRCH attr=cn Jul 25 10:43:24 cmlin02 slapd[10271]: <= bdb_equality_candidates: (member) not indexed Jul 25 10:43:24 cmlin02 slapd[10271]: <= bdb_equality_candidates: (uniqueMember) not indexed Jul 25 10:43:24 cmlin02 slapd[10271]: conn=1019 op=196 SEARCH RESULT tag=101 err=0 nentries=1 text=
CentOS named debug logging
I need to debug my DNS and the best way to do so is via logging. Therefore:
[root@cmlin02 ~]# vi /etc/named.conf
...
logging {
channel "default_syslog" {
#syslog local6;
file "/var/log/named/named.log" versions 3 size 5m;
severity debug;
};
category default { default_syslog; };
category general { default_syslog; };
category config { default_syslog; };
category security { default_syslog; };
category resolver { default_syslog; };
category xfer-in { default_syslog; };
category xfer-out { default_syslog; };
category notify { default_syslog; };
category client { default_syslog; };
category network { default_syslog; };
category update { default_syslog; };
#category queries { default_syslog; };
category lame-servers { default_syslog; };
};
...
[root@cmlin02 ~]# service named restart Stopping named: . [ OK ] Starting named: [ OK ]
[root@cmlin02 ~]# tail -f /var/log/named/named.log ...
centos /etc/resolv.conf resets itself on reboot
On centos, everytime I reboot /etc/resolv.conf resets itself. Turns out it is the PEERDNS var inside the network config.
[root@cmlin02 ~]# more /usr/share/doc/initscripts-9.03.27/sysconfig.txt PEERDNS=yes|no
modify /etc/resolv.conf if peer uses msdns extension (PPP only) or
DNS{1,2} are set, or if using dhclient. default to “yes”.
[root@cmlin02 ~]# more /etc/sysconfig/network-scripts/ifcfg-eth0 | grep PEERDNS [root@cmlin02 ~]# vi /etc/sysconfig/network-scripts/ifcfg-eth0 ... PEERDNS=no ...
then reboot