Linux (Page 7)

If you receive the error above in Nagios, the workaround is to exclude tracefs from the check_disk command. Login to your client server, nano /etc/nagios/nrpe.cfg   find the check_disk and add –exclude-type=tracefs It will looks like this: /usr/lib/nagios/plugins/check_disk -e –exclude-type=tracefs /etc/init.d/nagios-nrpe-server restart  Read More →

Upgrade the version: sudo apt-add-repository ‘deb http://archive.ubuntu.com/ubuntu yakkety main universe multiverse’ sudo apt-get update sudo apt-get install openssh-server=1:7.3p1-1 or we can install from source: wget http://mirror.exonetric.net/pub/OpenBSD/OpenSSH/portable/openssh-7.2p2.tar.gz tar -zxvf openssh-7.2p2.tar.gz cd openssh-7.2p2 ./configure make sudo make install  Read More →

This command will list out all services in Ubuntu:   service –status-all To stop / start any service   service service_name stop/start  Read More →

#Check the current kernel version uname -a See the list of installed kernels rpm -qa | grep kernel   Ubuntu CentOS: apt autoremove –purge   #remove all old kernels – keep the lastest 2 package-cleanup –oldkernels –count=2  Read More →

Set all ssh account to use bash shell by default , /etc/passwd Make sure that you have install exim or postfix or any other email tool to send mail Edit /etc/bash.bashrc , and the below lines echo ‘Date:’ date $’\n’WhoAmI: whoami \ $’\n’Who: $’\n'”who” \ $’\n’Netstat: $’\n'”netstat -nt | grep EST” \ $’\n’Process: $’\n'”ps -aux” \ | mail -aFrom:[email protected] -s “Security Alert: SSH Access(hostname -s)” [email protected] This script will send the following info : Date , WhoAMI, who , netstat, processlist Test (1) Copying the above code in your shell and run , make sure that you receive the email (2) Login to the serverRead More →

When you run apt-get install , you got some error this dpkg: dependency problems prevent configuration of linux-server: linux-server depends on linux-image-server (= 3.2.0.88.102); however: Version of linux-image-server on system is 3.2.0.113.129. linux-server depends on linux-headers-server (= 3.2.0.88.102); however: Version of linux-headers-server on system is 3.2.0.113.129. dpkg: error processing linux-server (–configure): Run the following command will fix the issue: apt-get remove linux-server apt-get install linux-serverRead More →

my mysql nagios plugin doesn’t work, tested with this command /usr/lib/nagios/plugins/check_mysql Error error while loading shared libraries: libmysqlclient.so.18: cannot open shared object file: No such file or directory It’s probably Ubuntu 16.04 is using higher mysql client version, while the nagios use lower version Here is the fix: cd ~root wget http://files.directadmin.com/services/debian_7.0_64/libmysqlclient.so.18 copy libmysqlclient.so.18 /usr/lib/x86_64-linux-gnu/ cd /usr/lib/x86_64-linux-gnu chmod 755 libmysqlclient.so.18 ldconfigRead More →

A complete guide https://svn.apache.org/repos/asf/subversion/trunk/subversion/mod_authz_svn/INSTALL If you want to setup a tool to manage the subversion over web , try if.SVNAdminRead More →

This works well on my Ubuntu 14.04 Based on http://fearby.com/article/update-openssl-on-a-digital-ocean-vm/ Method1: $ sudo apt-get update $sudo apt-get install –only-upgrade libssl1.0.0 openssl #check if it patches successfully. $ zgrep -ie “(CVE-2016-2108|CVE-2016-2107)” /usr/share/doc/libssl1.0.0/changelog.Debian.gz Output should be like this: debian/patches/CVE-2016-2107.patch: check that there are enough CVE-2016-2107 debian/patches/CVE-2016-2108-1.patch: don’t mishandle zero if it is debian/patches/CVE-2016-2108-2.patch: fix ASN1_INTEGER handling in CVE-2016-2108 Method2: $ sudo apt-get dist-upgrade $ wget ftp://ftp.openssl.org/source/openssl-1.0.2h.tar.gz $ tar -xvzf openssl-1.0.2h.tar.gz $ cd openssl-1.0.2h $ ./config –prefix=/usr/ $ make depend $ sudo make install $ openssl version OpenSSL 1.0.2h 3 May 2016 now restart your nginx or other server $ sudo service nginx restart check your website hereRead More →

I have a url like this https://www.dailyithelp.com/countries/us/12%26pensylvania so in normal situation, we only have 3 sub folder: countries,us,12/pensylvainia , but in Apache2 , it treats this as 4 : countries,us,12,pensylvania , Apache 2.4 cheats all url encoded slashes as normal slash , if you want to fix this you have to allow slash in the url. ServerName mywebsite.socm AllowEncodedSlashes OnRead More →