I would like to set up a cron job to automatically check whether my mailserver and webserver are up, and tell me if they're not.
This script tells me if my webserver is up:
#!/bin/bash wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com if [[ $? -eq 0 ]]; then echo "Online" else echo "Offline" fi
How can I do the something similar with my mailserver?
Or if someone knows of an integrated tool that will monitor this in a better way (whatever that may be), I'm more than interested.
On 11/04/2014 02:44 PM, John R Pierce wrote:
On 11/4/2014 11:36 AM, Frank Cox wrote:
Or if someone knows of an integrated tool that will monitor this in a better way (whatever that may be), I'm more than interested.
Nagios
I'd second nagios, but I think to -really- test smtp, you'd need an external email source, a specialized target user and cron on both sides (at least that'd how I'd do it, just to be sure mail is really flowing through). I also don't think cron for monitoring is a terribly good idea. and I think you also need to consider the implications of how you send out your alerts based on what you monitor. e.g. oh no .. email is down! quick! fetch me an admin; send an emai... d'oh!
On 2014-11-05, zep zgreenfelder@gmail.com wrote:
I'd second nagios, but I think to -really- test smtp, you'd need an external email source, a specialized target user and cron on both sides (at least that'd how I'd do it, just to be sure mail is really flowing through).
For just testing whether the SMTP server is up (which is what the OP originally requested) a nagios check may be sufficient. As another poster mentioned, he could use the check_smtp plugin (e.g., via cron, though I agree with you that cron isn't a great tool for monitoring) without running a full Nagios server.
For verifying that delivery is occuring successfully, you'd need more what you described, but even that's not going to be foolproof: maybe delivery to you is working fine, but delivery to other users isn't working properly. It's really up to the OP, how much work does he really want to put in?
--keith
For some fast and free monitoring along with DNS verification/blacklist/config checks of your MX records, MXToolbox lets you monitor one domain for free. Nice to have an external, independent source checking your public MTA. Nagios is still what I would choose for minute-by-minute checks but MXToolbox is free, and isn't tied to your infrastructure in any way.
On Wed, Nov 5, 2014 at 12:34 PM, Keith Keller kkeller@wombat.san-francisco.ca.us wrote:
On 2014-11-05, zep zgreenfelder@gmail.com wrote:
I'd second nagios, but I think to -really- test smtp, you'd need an external email source, a specialized target user and cron on both sides (at least that'd how I'd do it, just to be sure mail is really flowing through).
For just testing whether the SMTP server is up (which is what the OP originally requested) a nagios check may be sufficient. As another poster mentioned, he could use the check_smtp plugin (e.g., via cron, though I agree with you that cron isn't a great tool for monitoring) without running a full Nagios server.
For verifying that delivery is occuring successfully, you'd need more what you described, but even that's not going to be foolproof: maybe delivery to you is working fine, but delivery to other users isn't working properly. It's really up to the OP, how much work does he really want to put in?
--keith
-- kkeller@wombat.san-francisco.ca.us
CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
On 2014-11-07, Iain Morris iain.t.morris@gmail.com wrote:
For some fast and free monitoring along with DNS verification/blacklist/config checks of your MX records, MXToolbox lets you monitor one domain for free. Nice to have an external, independent source checking your public MTA. Nagios is still what I would choose for minute-by-minute checks but MXToolbox is free, and isn't tied to your infrastructure in any way.
I know we're getting a littl off topic, so I'll ask first: there are a bunch of external services I use to monitor things like DNS and SMTP which are difficult to get a true handle on from the inside. Is it too off-topic to talk about some of these resources on list?
(MXToolbox looks pretty interesting, I'll look into it for myself later.)
--keith
On Fri, Nov 7, 2014 at 1:59 PM, Keith Keller kkeller@wombat.san-francisco.ca.us wrote:
On 2014-11-07, Iain Morris iain.t.morris@gmail.com wrote:
For some fast and free monitoring along with DNS verification/blacklist/config checks of your MX records, MXToolbox lets you monitor one domain for free. Nice to have an external, independent source checking your public MTA. Nagios is still what I would choose for minute-by-minute checks but MXToolbox is free, and isn't tied to your infrastructure in any way.
I know we're getting a littl off topic, so I'll ask first: there are a bunch of external services I use to monitor things like DNS and SMTP which are difficult to get a true handle on from the inside. Is it too off-topic to talk about some of these resources on list?
(MXToolbox looks pretty interesting, I'll look into it for myself later.)
If you want to run your own - and have remote systems to handle it, opennms can run remote monitor agents (via java remoting) that report back to the central server.
El 04/11/14 a las 20:36, Frank Cox escribió:
I would like to set up a cron job to automatically check whether my mailserver and webserver are up, and tell me if they're not.
This script tells me if my webserver is up:
#!/bin/bash wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com if [[ $? -eq 0 ]]; then echo "Online" else echo "Offline" fi
How can I do the something similar with my mailserver?
Or if someone knows of an integrated tool that will monitor this in a better way (whatever that may be), I'm more than interested.
Hello
I use Nmap to test if a server up in a port:
$ nmap -p587 a.mail.server |grep -i 587
587/tcp open submission
Or several ports:
$ nmap -p25,143,587 a.mail.server |grep -i open 25/tcp open smtp 143/tcp open imap 587/tcp open submission
If the server is working, the port is shown as open. You can parse it as desired to message you as you want
Best
On 11/04/2014 02:49 PM, José María Terry Jiménez wrote:
El 04/11/14 a las 20:36, Frank Cox escribió:
I would like to set up a cron job to automatically check whether my mailserver and webserver are up, and tell me if they're not.
This script tells me if my webserver is up:
#!/bin/bash wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com if [[ $? -eq 0 ]]; then echo "Online" else echo "Offline" fi
How can I do the something similar with my mailserver?
Or if someone knows of an integrated tool that will monitor this in a better way (whatever that may be), I'm more than interested.
Hello
I use Nmap to test if a server up in a port:
$ nmap -p587 a.mail.server |grep -i 587
587/tcp open submission
Or several ports:
$ nmap -p25,143,587 a.mail.server |grep -i open 25/tcp open smtp 143/tcp open imap 587/tcp open submission
If the server is working, the port is shown as open. You can parse it as desired to message you as you want
Best _______________________________________________ CentOS mailing list CentOS@centos.org http://lists.centos.org/mailman/listinfo/centos
How about using nc with something like this: No server listening at 10.0.129.71 $ nc 10.0.129.71 25 << EOF QUIT EOF $ echo $? 1
Server listening at localhost $ nc localhost 25 << EOF QUIT EOF 220 sclark66.netwolves.com ESMTP Sendmail 8.14.4/8.14.4; Tue, 4 Nov 2014 15:03:22 -0500 221 2.0.0 sclark66.netwolves.com closing connection $ echo $? 0
On Tue, Nov 4, 2014 at 1:36 PM, Frank Cox theatre@melvilletheatre.com wrote:
Or if someone knows of an integrated tool that will monitor this in a better way (whatever that may be), I'm more than interested.
Overkill for one or a few sites, but: http://www.opennms.org/ can monitor most network services with a framework for alarms and notifications, plus keeping nice graph histories of snmp data (interface traffic, cpu/disk/memory use, etc.
Am 04.11.2014 um 20:36 schrieb Frank Cox theatre@melvilletheatre.com:
I would like to set up a cron job to automatically check whether my mailserver and webserver are up, and tell me if they're not.
This script tells me if my webserver is up:
#!/bin/bash wget -q --tries=10 --timeout=20 --spider http://melvilletheatre.com if [[ $? -eq 0 ]]; then echo "Online" else echo "Offline" fi
How can I do the something similar with my mailserver?
Or if someone knows of an integrated tool that will monitor this in a better way (whatever that may be), I'm more than interested.
mon - old lady but small:
$ yum -y install epel-release ; yum install mon
$ rpm -qi mon |grep -E 'Size|Summary' Size : 1155876 Summary : General-purpose resource monitoring system
$ rpm -ql mon | grep -E 'http|imap|smtp|pop&or$' /usr/lib64/mon/mon.d/http.monitor /usr/lib64/mon/mon.d/http_tppnp.monitor /usr/lib64/mon/mon.d/imap.monitor /usr/lib64/mon/mon.d/phttp.monitor /usr/lib64/mon/mon.d/smtp.monitor /usr/lib64/mon/mon.d/smtp3.monitor
$ vi /etc/mon/mon.cf
$ service mon start
$ monshow
and if you like (on EL{5,6}):
$ chkconfig mon on
-- LF
On Tue, 4 Nov 2014 23:41:36 +0100 Leon Fauster wrote:
mon - old lady but small:
It looks really cool, but boy does it have a list of dependencies:
fping is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Authen::PAM) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Authen::Radius) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(CGI) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(DBI) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Expect) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Mon::Client) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::Packet) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::RR) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::Resolver) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::LDAP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::SNPP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::Telnet) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(SNMP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(SNMP) >= 1.8 is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Statistics::Descriptive) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Sys::Syslog) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Time::HiRes) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Time::Period) is needed by mon-1.2.0-8.el7.centos.x86_64
Monit could do the job. It's probably slightly overkill but it doesn't do graph. It's purely a "is this service answering on that host" type of monitoring.
On 11/4/2014 7:35 PM, Frank Cox wrote:
On Tue, 4 Nov 2014 23:41:36 +0100 Leon Fauster wrote:
mon - old lady but small:
It looks really cool, but boy does it have a list of dependencies:
fping is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Authen::PAM) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Authen::Radius) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(CGI) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(DBI) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Expect) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Mon::Client) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::Packet) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::RR) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::Resolver) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::LDAP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::SNPP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::Telnet) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(SNMP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(SNMP) >= 1.8 is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Statistics::Descriptive) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Sys::Syslog) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Time::HiRes) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Time::Period) is needed by mon-1.2.0-8.el7.centos.x86_64
On 11/4/2014 7:35 PM, Frank Cox wrote:
On Tue, 4 Nov 2014 23:41:36 +0100 Leon Fauster wrote:
mon - old lady but small:
It looks really cool, but boy does it have a list of dependencies:
fping is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Authen::PAM) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Authen::Radius) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(CGI) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(DBI) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Expect) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Mon::Client) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::Packet) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::RR) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::DNS::Resolver) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::LDAP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::SNPP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Net::Telnet) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(SNMP) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(SNMP) >= 1.8 is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Statistics::Descriptive) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Sys::Syslog) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Time::HiRes) is needed by mon-1.2.0-8.el7.centos.x86_64 perl(Time::Period) is needed by mon-1.2.0-8.el7.centos.x86_64
It's a Perl program designed to test a bunch of different services. Of course it's going to require the Perl modules needed to do those queries.
-----BEGIN PGP SIGNED MESSAGE----- Hash: SHA1
It could be done using a crontab job and it's very efficient sometimes to use only a crontab job instead of nagios.
You can use the precompiled nagios scripts for the task. Unless you have constrains on the OS allowed languages and packages, which then should be evaluated more deeply to meet your needs which might be missing.
So: - - Nagios scripts as crontab job - - Other tcp level scripts as a crontab job - - fully fledged nagios - - other relevant solutions in your scope
Eliezer
On 11/04/2014 09:36 PM, Frank Cox wrote:
I would like to set up a cron job to automatically check whether my mailserver and webserver are up, and tell me if they're not.
On 11/4/2014 2:36 PM, Frank Cox wrote:
I would like to set up a cron job to automatically check whether my mailserver and webserver are up, and tell me if they're not.
This script tells me if my webserver is up:
...
How can I do the something similar with my mailserver?
How about a cron job that e-mails you the output of 'service httpd status' or equivalent? You'll get a message that tells you if your web server is up or not. If you don't get a message, your mail server is down! (HHOS.)
Unless you're just collecting performance or availability metrics for reports, how you intend to be notified is something to consider. It's trivial to have a web server's failing check result e-mailed to you, but you need an out-of-band notification method (an old Nokia phone attached to the serial port that emits an SMS message, for example) if your mail server is having difficulty.
-
Bowie Bailey -
Chris Beattie -
Eliezer Croitoru -
Frank Cox -
Iain Morris -
John R Pierce -
José María Terry Jiménez -
Keith Keller -
Laurent Dumont -
Leon Fauster -
Les Mikesell -
Steve Clark -
zep