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Monitoring your cluster with a home-grown OCF agent

30.11.2025

Home » Archive » 2012 » Issue 07: Xen v... »

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Data acquisition with shell tools

30.11.2025

Home » Archive » 2010 » Issue 2: Backup... »

"------------------------------------------------------" 18 echo -n "Replace stored data line (y)? ";read we 19 if [ "$we" = "y" ]; 20 then 21 22 # Delete line and write to 23 # temporary file 24 25 # Build sed instruction 26

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Tested: Autoconfiguring IPv6 clients

30.11.2025

Home » Archive » 2011 » Issue 5: Pen Te... »

, the MAC address (e.g., 00:11:22:33:44:55) is split down the middle, and two bytes containing FF:FE are inserted. This gives you 64 bits. If the basis is a globally unique address (which should be the case

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Port Knocking

07.10.2014

Home » Archive » 2014 » Issue 23: 10 Ti... »

seq_timeout = 10 08 tcpflags = syn 09 command = /usr/sbin/iptables -A INPUT -s \ %IP% -p tcp --dport 22 -j ACCEPT 10 11 [closeSSH] 12 sequence = 9000

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The practical benefits of network namespaces

15.08.2016

Home » Archive » 2016 » Issue 34: Softw... »

via 192.168.1.1 dev eth1 13 $ ip netns exec ns1 ping -c2 8.8.8.8 14 PING 8.8.8.8 (8.8.8.8) 56(84) bytes of data. 15 64 bytes from 8.8.8.8: icmp_seq=1 ttl=51 time=22.1 ms 16 64 bytes from 8.8.8.8: icmp

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Automate CentOS and RHEL installation with PXE

02.02.2021

Home » Archive » 2021 » Issue 61: Secur... »

timezone 19 timezone Europe/Vienna --isUtc --ntpservers 172.23.48.8,172.23.48.9 20 # user setup 21 user --name=example-user --password= --iscrypted --gecos="example-user" 22 # Disk partitioning

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Keeping Docker containers safe

13.02.2017

Home » Archive » 2017 » Issue 37: Distr... »

of around 250MB to Amazon's S3 storage very effectively. A number of successful container technologies have been used extensively in the past, including LXC, Solaris Zones, and FreeBSD jails, to name

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Storage system with OpenSolaris and Comstar

30.11.2025

Home » Archive » 2010 » Issue 0: Active... »

.168.209.200 07 192.168.209.200:3260,1 iqn.1986-03.com.sun:02:8f4cd1fa-b81d-c42b-c008-a70649501262 08 # iscsiadm -m node 09 # /etc/init.d/open-iscsi restart 10 # fdisk -l 11 Disk /dev/sdb: 2147 MB, 2147418112 bytes

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Monitor your nodes with collectl

30.11.2025

Home » Archive » 2012 » Issue 09: Windo... »

> output_16M.txt This IOzone command line is a simple sequential read and sequential write test using 16MB record sizes to a file that is 16GB in size (twice the physical memory). Once the testing

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Gathering Data on Environment Modules

10.09.2012

Home » HPC » Articles »

to logfiles, and it’s pretty simple to use: [laytonjb@test1 ~]$ logger "This is a test" ... [root@test1 ~]# tail -n 2 /var/log/messages Aug 22 15:54:47 test1 avahi-daemon[1398]: Invalid query packet. Aug 22 17

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