Difference between revisions of "Late booting of machine due to sendmail/sm-client services"
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<yambe:breadcrumb>System troubleshooting</yambe:breadcrumb> | |||
=Late booting of machine due to sendmail / sm-client services= | =Late booting of machine due to sendmail / sm-client services= | ||
Sometime Linux machines may take long time to boot due to sendmail / sm-client services which take lot of time to start during machine boot. This may happen because sendmail and sm-client are not able to resolve hostname to IP addresses. Hence we should check file '<tt>/etc/hosts</tt>' and verify that it contains mapping from both '<tt>127.0.0.1</tt>' and '<tt>::1</tt>' to hostname. | Sometime Linux machines may take long time to boot due to sendmail / sm-client services which take lot of time to start during machine boot. This may happen because sendmail and sm-client are not able to resolve hostname to IP addresses. Hence we should check file '<tt>/etc/hosts</tt>' and verify that it contains mapping from both '<tt>127.0.0.1</tt>' and '<tt>::1</tt>' to hostname. '''Also this mapping should be in first non-commented line of /etc/hosts file. Doing this mapping on second or third line wont help'''. | ||
This means that we should be careful when we change hostname by using '<tt>hostname</tt>' command or by modifying '<tt>/etc/sysconfig/network</tt>' file. We should also correspondingly modify '<tt>/etc/hosts</tt>' whenever we change system name. | This means that we should be careful when we change hostname by using '<tt>hostname</tt>' command or by modifying '<tt>/etc/sysconfig/network</tt>' file. We should also correspondingly modify '<tt>/etc/hosts</tt>' whenever we change system name. | ||
We should also let aliases localhost and localhost.localdomain remain in /etc/hosts file. If we remove their entries then too some system programs may stop working properly. | We should also let aliases localhost and localhost.localdomain remain in /etc/hosts file. If we remove their entries then too some system programs may stop working properly. | ||
Revision as of 06:24, 21 February 2015
<yambe:breadcrumb>System troubleshooting</yambe:breadcrumb>
Late booting of machine due to sendmail / sm-client services
Sometime Linux machines may take long time to boot due to sendmail / sm-client services which take lot of time to start during machine boot. This may happen because sendmail and sm-client are not able to resolve hostname to IP addresses. Hence we should check file '/etc/hosts' and verify that it contains mapping from both '127.0.0.1' and '::1' to hostname. Also this mapping should be in first non-commented line of /etc/hosts file. Doing this mapping on second or third line wont help.
This means that we should be careful when we change hostname by using 'hostname' command or by modifying '/etc/sysconfig/network' file. We should also correspondingly modify '/etc/hosts' whenever we change system name.
We should also let aliases localhost and localhost.localdomain remain in /etc/hosts file. If we remove their entries then too some system programs may stop working properly.
