Hi coders, I have been requested to report following issue in net-snmp. I would like to kindly ask you for your suggestion/opinion to solve this issue.
Thanks in advance for your replies. Issue description: net-snmp's configuration files are not resilient to power failure. following a power failure event users created with net-snmp-create-v3-user are missing from /etc/snmp/snmpd.conf and that /var/lib/net-snmp/snmpd.conf is empty. Steps to Reproduce: [root@rhel73 ~]# cat /etc/fstab UUID=8c3e7419-f4b9-425a-b535-b6849a6e68bf / xfs defaults 0 0 [root@rhel73 ~]# grep testuser /etc/snmp/snmpd.conf /var/lib/net-snmp/snmpd.conf [root@rhel73 ~]# ls -l /etc/snmp/snmpd.conf /var/lib/net-snmp/snmpd.conf -rw-------. 1 root root 18891 Dec 4 22:32 /etc/snmp/snmpd.conf -rw-------. 1 root root 1073 Dec 5 00:04 /var/lib/net-snmp/snmpd.conf [root@rhel73 ~]# systemctl stop snmpd [root@rhel73 ~]# /usr/bin/net-snmp-create-v3-user -A testpass testuser [root@rhel73 ~]# ls -l /etc/snmp/snmpd.conf /var/lib/net-snmp/snmpd.conf -rw-------. 1 root root 18877 Dec 5 00:09 /etc/snmp/snmpd.conf -rw-------. 1 root root 1112 Dec 5 00:09 /var/lib/net-snmp/snmpd.con [root@rhel73 ~]# grep testuser /etc/snmp/snmpd.conf /var/lib/net-snmp/snmpd.conf /etc/snmp/snmpd.conf:rwuser testuser /var/lib/net-snmp/snmpd.conf:createUser testuser MD5 "testpass" DES [root@rhel73 ~]# systemctl start snmpd Force power off and reconnect. [root@rhel73 ~]# grep testuser /etc/snmp/snmpd.conf /var/lib/net-snmp/snmpd.conf [root@rhel73 ~]# ls -l /etc/snmp/snmpd.conf /var/lib/net-snmp/snmpd.conf -rw-------. 1 root root 18861 Dec 5 00:09 /etc/snmp/snmpd.conf -rw-------. 1 root root 0 Dec 5 00:09 /var/lib/net-snmp/snmpd.conf Actual results: The added user has been lost from the configuration. The entire /var/lib/net-snmp/snmpd.conf has been lost. Expected results: /etc/snmp/snmpd.conf contains the newly added user. /var/lib/net-snmp/snmpd.conf is not destroyed. Additional info: This was observed for XFS root filesystems, it may be that the default Ext's data=ordered mode behaves differently. Running this under strace snmpd is doing a rename/rewrite of the file. But it never calls fsync, so for the XFS case the dirty buffers are still in memory when the box is powered off, only the rename and create have hit the disk. Josef Ridky Associate Software Engineer Core Services Team Red Hat Czech, s.r.o. ------------------------------------------------------------------------------ Check out the vibrant tech community on one of the world's most engaging tech sites, Slashdot.org! http://sdm.link/slashdot _______________________________________________ Net-snmp-coders mailing list Net-snmp-coders@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/net-snmp-coders
