Month: August 2021

PowerPath on RHEL7 — disabling native DM-Multipath

Linux Device mapper multipathing (DM Multipath) allows you to configure multiple I/O paths between server nodes and storage arrays into a single device. These I/O paths are physical SAN connections that can include separate cables, switches, and controllers. Multipathing aggregates the I/O paths, creating a new device that consists of the aggregated paths. DM Multipath … Continue reading PowerPath on RHEL7 — disabling native DM-Multipath →

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Strange problem with http_proxy environment variable

Strange problem I ran into today: http_proxy environment at shell level doesn't work no matter I use curl or wget. export http_proxy=http://10.10.26.254:80 Curl works when I specify the proxy setting with "--proxy" or "-x". With "-v" verbose option, I can see curl still tries to connect to the destination directly when http_proxy is set. For … Continue reading Strange problem with http_proxy environment variable →

Two possible issues when ssh from a secured (FIPS enabled) RH Linux 8 to RHL 6

With RHLinux 8, OpenSSH has been updated to the version 8.0. root@ol8test:~# ssh -V OpenSSH_8.0p1, OpenSSL 1.1.1g FIPS 21 Apr 2020 If a Linux 8 system is secured, some weak key exchange algorithms might be disabled/removed. When connecting from such a system to a legacy system e.g. Linux 6, you will see the following errors: … Continue reading Two possible issues when ssh from a secured (FIPS enabled) RH Linux 8 to RHL 6 →

Windows turning off network discovery or file and printer sharing activate Public profile for the firewall

I have built a small lab with 2 Windows 2012 VMs from the same template. To simulate another environment, I've shared some folders out from VM1 so that both VMs can access them. However I noticed that VM2 cannot access them with the error code: 0x80070035 -- The network path was not found. As a … Continue reading Windows turning off network discovery or file and printer sharing activate Public profile for the firewall →