Category Archives: Linux

Exim Mail-Server with Microsoft (Office) 365 and TLS errors

By | 2020-05-08

In the last days I got several calls, that I cannot receive emails from NetApp. After some debugging I found out, that my exim mailserver seems to refuse mails from NetApp which are received via some * domains: 2020-05-08 15:34:00 TLS error on connection from ( [] (recv): Error in the pull function. 2020-05-08… Read More »

VMware vCenter Server Appliance Monitoring

By | 2019-11-27

In the last years we had multiple problems with our VMware vCenter Server Appliances, because for example the filesystem for the SEAT database ran full. Without having a look at the appliance management interface, you will have to spend much time for debugging your problems. To prevent these kind of problems, I’ve written some scripts… Read More »

vSphere 6.7: Automated consistent VMware vCSA Backup

By | 2018-05-23

In an old post I described how to make an automated and consistent backup of VMware vCenter Server Appliance with vSphere 6.5 and some Linux Bash scripts. With vSphere 6.7, VMware introduced a new feature called “Backup Schedule”: Now you can configure a schedule for the backup (including a cleanup job) – there is no need for… Read More »

RRDtool grading graphs

By | 2018-03-20

One of my oldest IT articles from about 2005 🙂 Introduction This HOWTO describes how to quickly generate a nice graph, showing you the average ping time off a specific host. This picture is the result we should get: This setup consists of 4 steps * Configfile * RRDcreate * RRDupdate * RRDgraph Configfile The… Read More »

UMTS Modem on Raspberry PI

By | 2018-01-30

Problems with Huawei UMTS Modems: Bus 001 Device 005: ID 12d1:1446 Huawei Technologies Co., Ltd. E1552/E1800/E173 (HSPA modem) vs Bus 001 Device 005: ID 12d1:1436 Huawei Technologies Co., Ltd. E173 3G Modem (modem-mode) Solution pi:/root # cat /etc/udev/rules.d/41-usb_modeswitch.rules ACTION==”add”, SUBSYSTEM==”usb”, ATTRS{idVendor}==”12d1″, ATTRS{idProduct}==”1446″, RUN+=”/usr/sbin/usb_modeswitch -v 12d1 -p 1446 -I -M ‘55534243123456780000000000000011062000000100000000000000000000’”