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Eskiden çok sevdiğim bir sitede vardı: Tamamen boş, fonksiyonu olmayan bir buton :) "stress tuşunda anlam arayan varsa, derhal siteyi terketsin..." Olayı abartmamak lazım tabi: 
 
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During latest leap second test activities, I was tinkering with my test NTP server and I encountered an error: There is not much help on internet. You just need to seed with the following command: And if you have an error: For details: http://support.ntp.org/bin/view/Support/ConfiguringAutokey  08/12/2016 @ 16:56 |  Etiketler: /root/.rnd, authentication, autokey, crypto, leap second, ntp, ntpd, randfile, RAND_load_file, SSL | Kategoriler: Bilgisayar, Linux, Tech |  Yorum yok Recently I installed VMware ESXi on a HP DL160 Gen9 server and couldn’t boot afterwards. After a short investigation I found out that the default configuration of the controller prevents booting. The controller should be configured and enabled to support SATA AHCI mode. Actually it is necessary to configure it for all servers carrying HP Smart Array B110i, B120i, B140i and B320i RAID controllers. To do that: 1) In BIOS/UEFI, go into “System Options” For a similar case in RedHat: http://access.redhat.com/articles/118133 13/07/2016 @ 10:13 | Etiketler: AHCI, B110i, B120i, B140i, controller, Gen9, HP, RAID, SATA, Smart Array | Kategoriler: Bilgisayar, Linux, Tech, VMware | Yorum yok This week one of our services, written in Java and residing on a TomCat, Red Hat 6.3 server had an interesting problem. Suddenly server seemed to have CPU congestion. According to top output, Java processes were the reason of congestion. But it showed more %sy CPU utilization than %us. Java threads were actually using 10-15% and the rest was used by OS itself. nmon values for context switching was far more beyond the values of the service on second node. Process causing this was interestingly ksoftirqd. A little investigation in internet proved that this was because of the “leap second” issue. As soon as issuing the commands below for workaround, CPU usage dropped drastically:
However what triggered the problem after over a month is still a mystery. For more information about the matter: Leap Second Detector for RHEL 14/08/2015 @ 14:41 | Etiketler: context switch, cpu, java, ksoftirqd, leap second, ntpd, red hat, rhel, tomcat | Kategoriler: Bilgisayar, Linux, Tech | Yorum yok I’ve installed a RedHat Enterprise Linux Server 6.5 from a kickstart install file. Everything was OK until I tried to login from tty console. You type “root” and then the password but screen refreshes and it is like you haven’t typed anything. No error, nothing… I’ve tried to install again but it was the same. I was sure that I had done nothing different from our standard physical server provisioning. I’ve opened the system in single mode. After I spent some time for troubleshooting with my colleagues, we found the answer in /var/log/secure : Feb 24 10:38:25 srv1 login: PAM unable to dlopen(/lib64/security/pam_tally.so): /lib64/security/pam_tally.so: cannot open shared object file: No such file or directory Feb 24 10:38:25 srv1 login: PAM adding faulty module: /lib64/security/pam_tally.so Feb 24 10:38:28 srv1 login: FAILED LOGIN SESSION FROM (null) FOR root, Module is unknown Eventually we found out that the kickstart file was changed. It was because of the non-existent pam.d libraries. I’ve changed the line in /etc/pam.d/system-auth to this: auth required pam_tally2.so deny=5 unlock_time=36000 audit
Nothing special for RHEL, just might hit you in any Linux. Keep in mind.. Teknolojinin bu hale gelebilmesini sağlayanlardan biri olan Dennis MacAlistair Ritchie (nam-ı diğer dmr) 12 Ekim 2011’de hayata veda etti. Birçok programlama diline öncülük eden C’nin ve şu an kullandığımız işletim sistemlerinin atası olan UNIX’in mucidi muhtemelen dokunmatik ekranlı cep telefonu yapan biri kadar hatırlanmayacak. Hayatımı kazanmamı sağlayan, insanlık tarihine yaptığın bu eşsiz katkıların için sonsuz teşekkürler… “UNIX is very simple, it just needs a genius to understand its simplicity.”
Mühim bir şey değil ama madem yaptık arayalım, aratalım.. Buyrun: Firefox Search+ extension.. (Yükleme talimatları zip içindeki readme.txt’de) 11/11/2006 @ 15:51 | Etiketler: firefox, search extension | Kategoriler: Bilgisayar, Linux | Yorum yok A GUI is like a machine. Click the button and it does one thing. Opening a shell is like rubbing a magic lamp. When you see the prompt user@here> it is really saying ‘Oh great and mighty master, what tasks would you have me perform for you?’. So all you have to do is ask and it will be done. David Martin on LinuxToday Dün akşam IEEE Sistem’le server yedeklerken Kerem sayesinde müthiş bir Linux komutu öğrendim. Format atmadan sistemi öldürmek için birebir: aptitude suicide.. Şaka bi yana esas komedi benim duman olmuş kafayla “Hakkat?” sorusunu sormam oldu.. Ahmet de bana yemek siparişi konulu aşağıdaki diyaloğuyla destek verdi: Gökhan: Telefon etsenize olm adamlara.. |
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Yine bir gün ek$isözlüğü karıştırırken aklıma geldi: Bir eklentisi olsa da aramayı Firefox’tan yapsam.. Kesin bunu yapmış suser’lar vardır diye düşündüm. Yapılmışları da araştırmaya üşendim açıkçası 🙂 Kısa birşeyse oturup kendim yazayım dedim. Halihazırda varolan search extension’lara bakınca da çok da büyük bi mesele olmadığını anladım. Sonrasında diğer sık kullanılan sitelere de aynısını uyguladım.. (YouTube fikri için Murat’a teşekkürler) 🙂
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