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48%
Monitoring your cluster with a home-grown OCF agent
30.11.2025
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© Aleksey Mnogosmyslov, 123RF.com
_RESKEY_user doesn't exist" 20 return $OCF_ERR_INSTALLED 21 fi 22 23 getent group $OCF_RESKEY_group >/dev/null 2>&1 24 rc=$? 25 if [ $rc -ne 0 ]; then 26 ocf_log err "Group $OCF
48%
Netcat – The admin's best friend
31.10.2025
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© Dmitry Rukhlenko, 123RF.com
'll take a quick look at a TCP port range. For example, you might want to use netcat (nc) to check FTP ports – or at least ports in that region: # nc -v -z examplehost.tld 21-25 If you want to change
48%
Using the Expect scripting environment
30.11.2025
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© Ivan Mikhaylov, 123RF.com
} 19 20 -re "($|%|>) " { interact } 21 22 timeout { 23 send_tty "No response from $host\n" 24 exit 25 } 26 } The script begins as usual by saving its arguments into variables
48%
High availability clustering on a budget with KVM
30.11.2025
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Yulia Saponova, 123RF.com
for the configuration step: # pvcreate /dev/sdb1 # vgcreate vg_cluster /dev/sdb1 # lvcreate -n lv_vm1 -L 50G vg_cluster # lvcreate -n lv_vm2 -L 50G vg_cluster The first command deposits the required LVM signature
47%
Configuring the JBoss application server
30.11.2025
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HONGQI ZHANG, 123RF.com
example, Mar 25, 2011, PrivateKeyEntry, 33 Certificate fingerprint (MD5): AC:D5:CB:5C:13:9D:EF:F2:85:6B:AB:89:49:F8:48:3A Finally, to enable the web connector's HTTPS port, you need to add
47%
Creating and evaluating kernel crash dumps
31.10.2025
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© Giuseppe Ramos, 123RF.com
kernel sles:~ # grep crash /proc/cmdline root=/dev/disk/by-uuid/10a83ffe-5a9f-48a2-b8cb-551c2cc6b42d resume=/dev/sda3 splash=silent text showopts crashkernel=128 sles:~ # /etc/init.d/boot.kdump status
47%
Warding off the rise of VoIP spam
30.11.2025
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Izaokas Sapiro, 123RF.com
. Listing 1 A SIP Request 01 INVITE sip:bob@tuwien.ac.at SIP/2.0 02 Via: SIP/2.0/UDP myhost.myprovider.de;branch=z9hG4bK776asdhds 03 ... 04 To: Bob 05 ... 06 From: Alice
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An IT nomad's diary
30.11.2025
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© Jasmin Merdan, 123RF.com
! Your application is now published here: 25 26 http://spaceuploader-tuxgeek.rhcloud.com/ 27 28 The remote repository is located here: 29 ssh://df488b98f21847c6907a6b2193bff2dc
47%
Taming the HPC Software Stack Fragmentation Problem
21.07.2026
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managed stack. References [1] DeLucia, A., and E. Moore. Analyzing HPC support tickets: Experience and recommendations. arXiv:2010.04321  [cs.DC]; 2020;10p, https://arxiv.org/abs/2010.04321 [2] Wolter, N
47%
Storage system with OpenSolaris and Comstar
30.11.2025
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Aleksandr Fomenkov, 123RF.com
/vol1 2G 9.72G 65.3M - 05 05 # zfs get volsize mypool/vol1 06 06 NAME PROPERTY VALUE SOURCE 07 07 mypool/vol1 volsize 2G - 08 09 The volume is currently 2GB. The following commands expand it to 3GB. 10 11

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