Error: Could not read host and service status information!

[buee]

So the doc is created with multiple sections for different OS's to remove confusion.

It might be that the doc is now outdated if Ubuntu has updated PHP to 7 and the doc is built around older PHP versions.

Yeah, I saw that section was for CentOS, but I figured I'd check anyway. So what are the next steps?

[Box293]

What do the apache logs say?

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tail -n 20 /var/log/apache2/error.log
tail -n 20 /var/log/apache2/access.log

[buee]

What do the apache logs say?

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tail -n 20 /var/log/apache2/error.log
tail -n 20 /var/log/apache2/access.log

Just did a page refresh prior to grabbing the logs:

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tail -20 /var/log/apache2/error.log
[Fri Jan 24 06:25:03.714439 2020] [mpm_prefork:notice] [pid 19323] AH00163: Apache/2.4.18 (Ubuntu) configured -- resuming normal operations
[Fri Jan 24 06:25:03.714472 2020] [core:notice] [pid 19323] AH00094: Command line: '/usr/sbin/apache2'

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tail -20 /var/log/apache2/access.log
127.0.0.1 - - [24/Jan/2020:07:51:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:07:56:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:01:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:06:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:11:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:16:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:21:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:26:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:31:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:36:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:41:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:46:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:51:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:08:56:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:09:01:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:09:06:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:09:11:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:09:16:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:09:21:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"
127.0.0.1 - - [24/Jan/2020:09:26:56 -0600] "GET / HTTP/1.1" 200 11595 "-" "check_http/v2.1.2 (monitoring-plugins 2.1.2)"

[scottwilkerson]

Can we see the permissions of the following dirs to verify the www-data user or nagios group has access to read all

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ls -l /var/cache/nagios3
ls -l /var/cache
ls -l /var

[buee]

Can we see the permissions of the following dirs to verify the www-data user or nagios group has access to read all

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ls -l /var/cache/nagios3
ls -l /var/cache
ls -l /var

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ls -l /var/cache/nagios3
total 204
-rw-r--r-- 1 nagios www-data 69939 Jan 20 17:31 objects.cache
-rw-rw-r-- 1 nagios www-data 66516 Jan 24 17:07 status.dat
-rw-rw-r-- 1 nagios www-data 63308 Jan 20 16:51 status.dat.back

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ls -l /var/cache
total 48
drwxr-xr-x  3 root     root     4096 Jun 12  2019 apache2
drwxr-xr-x  2 root     root     4096 Apr 12  2016 apparmor
drwxr-xr-x  3 root     root     4096 Jan 24 06:28 apt
drwxr-xr-x  3 root     root     4096 Jun 12  2019 dbconfig-common
drwxr-xr-x  2 root     root     4096 Jan 22 06:25 debconf
drwxr-xr-x  2 root     root     4096 Jun 12  2019 fontconfig
drwx------  2 root     root     4096 Jan 24 06:07 ldconfig
drwxr-sr-x 27 man      root     4096 Jan 24 06:25 man
-rw-r--r--  1 root     root        0 Jan 24 07:18 motd-news
drwxr-s---  2 nagios   www-data 4096 Jan 24 17:08 nagios3
drwxr-xr-x  2 root     root     4096 May 23  2019 samba
drwxr-xr-x  2 root     root     4096 Jan 20 15:28 snapd
drwxr-xr-x  2 www-data www-data 4096 Apr  4  2016 tcpdf

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ls -l /var
total 52
drwx------  2 root root   4096 Jan 20 15:28 agentx
drwxr-xr-x  2 root root   4096 Jan 24 06:25 backups
drwxr-xr-x 14 root root   4096 Oct 23 12:55 cache
drwxrwxrwt  2 root root   4096 Jun 22  2019 crash
drwxr-xr-x 55 root root   4096 Nov  7 12:43 lib
drwxrwsr-x  2 root staff  4096 Apr 12  2016 local
lrwxrwxrwx  1 root root      9 Jun 12  2019 lock -> /run/lock
drwxrwxr-x 14 root syslog 4096 Jan 24 06:25 log
drwxrwsr-x  2 root mail   4096 Apr 20  2016 mail
drwxr-xr-x  2 root root   4096 Apr 20  2016 opt
lrwxrwxrwx  1 root root      4 Jun 12  2019 run -> /run
drwxr-xr-x  2 root root   4096 Apr 19  2016 snap
drwxr-xr-x  5 root root   4096 Jun 12  2019 spool
drwxrwxrwt  6 root root   4096 Jan 24 16:39 tmp
drwxr-xr-x  3 root root   4096 Jun 12  2019 www

Additionally, I did sudo su - nagios then touch /var/cache/nagios3/text.txt then checked permissions:

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total 212K
drwxr-s---  2 nagios www-data 4.0K Jan 24 17:11 .
drwxr-xr-x 14 root   root     4.0K Oct 23 12:55 ..
-rw-r--r--  1 nagios www-data  69K Jan 20 17:31 objects.cache
-rw-rw-r--  1 nagios www-data  65K Jan 24 17:11 status.dat
-rw-rw-r--  1 nagios www-data  62K Jan 20 16:51 status.dat.back
-rw-rw-r--  1 nagios www-data    0 Jan 24 17:10 test.txt

[buee]

Any other suggestions, ideas, or things to check?

[tgriep]

Make sure that the nagios user account is still active and not expired.
Run this to check it.

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chage -l nagios

What is the user account you are using to login to the web interface?
Is it setup in the cgi.cfg to access the system status data?

Try editing the /etc/groups file and add the nagios user account to www-data group.
Restart Nagios and Apache.

[buee]

Make sure that the nagios user account is still active and not expired.
Run this to check it.

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chage -l nagios

What is the user account you are using to login to the web interface?
Is it setup in the cgi.cfg to access the system status data?

Try editing the /etc/groups file and add the nagios user account to www-data group.
Restart Nagios and Apache.

chage -l nagios output:

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Last password change                                    : Jun 12, 2019
Password expires                                        : never
Password inactive                                       : never
Account expires                                         : never
Minimum number of days between password change          : 0
Maximum number of days between password change          : 99999
Number of days of warning before password expires       : 7

The user for HTML basicauth, "buee", appears to be authorized for everything in the cgi.cfg file. The readonly section is completely commented out, other than that, every line that begins with "auth" ends with "=buee".

The nagios user is already part of the www-data group:

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nagios:x:1001:www-data,nagios

IIRC, I had to do this so I could ack, schedule downtime, and/or trigger a forced check through the web interface.

[tgriep]

Actually, what you have shown, these users www-data,nagios are part of the nagios group, not the other way around.

If you login as the nagiosadmin, does the system display the same error?

[buee]

Actually, what you have shown, these users www-data,nagios are part of the nagios group, not the other way around.

If you login as the nagiosadmin, does the system display the same error?

Good point! The nagios user was not in the www-data group. I added it, but no difference, sadly. Here is my current /etc/group file:

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cat /etc/group | grep www
www-data:x:33:nagios
nagios:x:1001:www-data,nagios
nagcmd:x:1002:nagios,www-data

From a Linux standpoint, the only user as far as Nagios is concerned is 'nagios' and 'nagcmd' as shown above. For the web interface, 'buee' is it, there is no 'nagiosadmin' user. Do you want me to create a new user in the htpasswd.users file and see if I get the error?