After check_mk is integrated with icinga, all hosts are down.

Service status, and host is down.

Carefully read the log:

The first idodb service is not started:

service ido2db start service icinga restartservice apache2 restart

Visit the website, host or down.
Check the log again:

[1368754991] error executing command '/usr/lib/nagios/plugins/check_icmp': No such file or directory. Make sure that the file actually exists (in PATH, if set) and is executabl\e!

The correct check_icmp path is:

/usr/local/icinga/libexec/check_icmp

The problem is that the check_mk installation script installs the check_mk_templates.cfg file to the/usr/local/icinga/etc/CONF. d/directory.

Modify the configuration as follows:

define command {  command_name  check-mk-ping#  command_line  /usr/lib/nagios/plugins/check_icmp $ARG1$ $HOSTADDRESS$                                                                                                           command_line  /usr/local/icinga/libexec/check_icmp $ARG1$ $HOSTADDRESS$}# Check for clusters: it is UP if at least one node is up                                                                                                                        define command {  command_name check-mk-ping-cluster#  command_line /usr/lib/nagios/plugins/check_icmp -m 1 $ARG1$ $_HOSTNODEIPS$                                                                                                      command_line /usr/local/icinga/libexec/check_icmp -m 1 $ARG1$ $_HOSTNODEIPS$}

Then restart icinga. Everything is OK.