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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
47%
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%
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%
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
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
46%
Monitoring with Zabbix
30.11.2025
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© Les Cunliffe, 123RF.com
types (geographical, infrastructure, and so on), which is part of the default installation scope. Shapes and Sizes Zabbix is released under the GNU GPL, and the latest version 1.8.9 can be downloaded

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