# Services **URL:** https://linux-tips.com/c/services/14.md [Latest](https://linux-tips.com/latest.md) · [Categories](https://linux-tips.com/categories.md) --- ## [About the Services category](https://linux-tips.com/t/about-the-servers-category/20)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 0
All about the services and daemons (web servers, proxy servers, samba, openldap, ssh, dns etc.) --- ## [Docker MTU problems](https://linux-tips.com/t/docker-mtu-problems/865)
**Author:** [@DrSlump](https://linux-tips.com/u/DrSlump)\ **Replies:** 0\ **Last updated:** [February 15, 2022, 9:47am UTC](https://linux-tips.com/t/docker-mtu-problems/865 "2022-02-15T09:47:31Z")
When using docker in cloud platforms (based on OpenStack or custom platforms like Hetzner) it is common to work with MTU size less than 1500. If you’re using docker in such an environment, connections from docker contai… --- ## [How can I disable snmpd ia\_addr insert messages?](https://linux-tips.com/t/how-can-i-disable-snmpd-ia-addr-insert-messages/281)
**Author:** [@RaskoX](https://linux-tips.com/u/RaskoX)\ **Replies:** 4\ **Last updated:** [November 8, 2020, 11:57am UTC](https://linux-tips.com/t/how-can-i-disable-snmpd-ia-addr-insert-messages/281 "2020-11-08T11:57:01Z")
Hi, We have Debian and Ubuntu servers which runs snmpd service. We are getting following message every 30 seconds in /var/log/syslog: error on subcontainer 'ia\_addr' insert (-1) How can we solve this problem? --- ## [Routing urls to different backends in haproxy](https://linux-tips.com/t/routing-urls-to-different-backends-in-haproxy/24)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 1\ **Last updated:** [October 19, 2017, 3:09pm UTC](https://linux-tips.com/t/routing-urls-to-different-backends-in-haproxy/24 "2017-10-19T15:09:29Z")
Haproxy is a very advanced layer7 opensource loadbalancer software. If you want to decrease priority of some urls in your setup, you can define ACL rules to detect traffic type and route to different backends which can h… --- ## [Exim and hostname fqdn problem](https://linux-tips.com/t/exim-and-hostname-fqdn-problem/216)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 1\ **Last updated:** [May 7, 2017, 3:19pm UTC](https://linux-tips.com/t/exim-and-hostname-fqdn-problem/216 "2017-05-07T15:19:20Z")
For some type of setups, if network connections not available during startup process, exim4 takes long time to start. To solve this problem, you must use DC\_minimaldns option of exim4. You can also configure this feature… --- ## [Mapping subdomains to parametered web pages in Apache](https://linux-tips.com/t/mapping-subdomains-to-parametered-web-pages-in-apache/176)
**Author:** [@demirezen](https://linux-tips.com/u/demirezen)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 2:42pm UTC](https://linux-tips.com/t/mapping-subdomains-to-parametered-web-pages-in-apache/176 "2015-08-03T14:42:37Z")
Mapping john.webserver.com to http://www.webserver.com/user.php?name=john is just by changing a few parameters in http.conf file. \ ServerAdmin info@servername.com Docu… --- ## [Securing your qmail-popup server (port 995)](https://linux-tips.com/t/securing-your-qmail-popup-server-port-995/175)
**Author:** [@demirezen](https://linux-tips.com/u/demirezen)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 2:40pm UTC](https://linux-tips.com/t/securing-your-qmail-popup-server-port-995/175 "2015-08-03T14:40:23Z")
qmail-popup provides text-based access to your mailboxes. You can secure this connection by applying ssl based configuration in your system. Below is an example on GNU Debian/Linux where qmail is a mail transfer agent. … --- ## [Viewing specific message in exim mail queue](https://linux-tips.com/t/viewing-specific-message-in-exim-mail-queue/141)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 12:08pm UTC](https://linux-tips.com/t/viewing-specific-message-in-exim-mail-queue/141 "2015-08-03T12:08:50Z")
To look for a messages's header in exim mail queue, you can use: exim -Mvh \ Or if you want to look at message's body: exim -Mvb \ where message-id is uniq identification of mail in the system… --- ## [Looking exim mail queue like mailq](https://linux-tips.com/t/looking-exim-mail-queue-like-mailq/140)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 12:07pm UTC](https://linux-tips.com/t/looking-exim-mail-queue-like-mailq/140 "2015-08-03T12:07:51Z")
If you want to kust to look at exim mail queue as mailq utility, you can use following command: exim -bp If you just want to learn how many messages in queue, just type: exim -bpc --- ## [Permit relaying to a list of ip address in exim](https://linux-tips.com/t/permit-relaying-to-a-list-of-ip-address-in-exim/139)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 12:07pm UTC](https://linux-tips.com/t/permit-relaying-to-a-list-of-ip-address-in-exim/139 "2015-08-03T12:07:07Z")
If you want to relay some ip addresses in your exim mail server, you just enter it to /etc/alwaysrelay file one per line as below: 1.2.3.4 177.188.199.200 and restart exim. --- ## [Removing specific message(s) from exim mail queue](https://linux-tips.com/t/removing-specific-message-s-from-exim-mail-queue/138)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 12:01pm UTC](https://linux-tips.com/t/removing-specific-message-s-from-exim-mail-queue/138 "2015-08-03T12:01:55Z")
Exim comes with an excellent utility called exiqgrep which has lots of grep like functionality on queues. For example to find all messages which has info@xxx.com as recipient: exiqgrep -r info@xxx.com If you want to s… --- ## [How to clear exim mail queue](https://linux-tips.com/t/how-to-clear-exim-mail-queue/137)
**Author:** [@demirten](https://linux-tips.com/u/demirten)\ **Replies:** 0\ **Last updated:** [August 3, 2015, 12:00pm UTC](https://linux-tips.com/t/how-to-clear-exim-mail-queue/137 "2015-08-03T12:00:20Z")
Sometimes it is necessary to remove all frozen messages in exim mail queue immediately. To do this just use: exim -bpu | grep frozen | awk {'print $3'} | xargs exim -Mrm command. You can also use specific exiqgrep com…