Oracle&Linux 4ever
March 9, 2019 Leave a comment
Sometimes script fails and error mentiones the line number, where there is a mistake. One option is to open a file and go to the mentioned line.
I am going to show you how to use SED to print only the certain line from the script file:
# sed -n ’80p’ /u01/app/18.3.0/grid/crs/script/mount-dbfs.sh
“My 80th line”
Where 80 is the line number and p “print[s] the current pattern space”
February 4, 2019 2 Comments
Problem:
I wanted to check if our customer had an issue with network access. I asked him to run telnet command, but because of their security reasons, telnet rpm was not installed at all.
Solution:
One of the solution would be to run nc 🙂 but of course nc was not installed. 🙂
The following command helped me in that situation:
cat < /dev/tcp/192.168.3.4/3260
The port is open if there is no output, but if you receive the following, then the port is closed:
-bash: connect: Connection refused
-bash: /dev/tcp/192.168.3.4/3261: Connection refused
December 19, 2018 Leave a comment
Problem:Â
Not able to install blobfuse on RHEL7.
Error:
Error: Package: blobfuse-1.0.2-1.x86_64 (packages-microsoft-com-prod)
Requires: libgnutls.so.26(GNUTLS_1_4)(64bit)
Error: Package: blobfuse-1.0.2-1.x86_64 (packages-microsoft-com-prod)
Requires: libgnutls.so.26(GNUTLS_2_10)(64bit)
Error: Package: blobfuse-1.0.2-1.x86_64 (packages-microsoft-com-prod)
Requires: libgnutls.so.26()(64bit)
You could try using –skip-broken to work around the problem
You could try running: rpm -Va –nofiles –nodigest
Solution:
sudo yum remove packages-microsoft-prod-1.0-1.el7.noarch
sudo yum clean all
sudo rm -rf /var/cache/yum
sudo rpm -Uvh https://packages.microsoft.com/config/rhel/7/packages-microsoft-prod.rpm
sudo yum install blobfuse fuse -y
December 18, 2018 Leave a comment
VNC is useful when you want to run DBCA or some other tool in GUI mode. If the connection between your computer and server fails, running application in VNC continues working and you can reconnect to your previous session.
I have noticed very strange behavior of VNC on my Linux 7.5, it maybe the same on other versions.
Problem:
Start VNC:
$ vncserver -geometry 1024×1024
New ‘stbyracq.example.com:1 (oracle)’ desktop is stbyracq.example.com:1
Starting applications specified in /home/oracle/.vnc/xstartup
Log file is /home/oracle/.vnc/stbyracq.example.com:1.log
Check VNC process:
$ ps -ef|grep vnc
root 20629 2570 0 16:36 pts/1 00:00:00 grep –color=auto vnc
Shows only GREP process.
Let’s check the log file:
$ cat /home/oracle/.vnc/stbyracq.example.com:1.log
Xvnc TigerVNC 1.8.0 – built Aug 31 2018 12:04:07
Copyright (C) 1999-2017 TigerVNC Team and many others (see README.txt)
See http://www.tigervnc.org for information on TigerVNC.
Underlying X server release 12001000, The X.Org FoundationTue Dec 18 16:38:05 2018
vncext: VNC extension running!
vncext: Listening for VNC connections on all interface(s), port 5901
vncext: created VNC server for screen 0
/usr/bin/xterm: cannot load font ‘-misc-fixed-medium-r-semicondensed–13-120-75-75-c-60-iso10646-1’
Killing Xvnc process ID 21100
XIO: fatal IO error 2 (No such file or directory) on X server “:1”
after 90 requests (90 known processed) with 4 events remaining.
Solution:
Check xstartup script:
$ cat /home/oracle/.vnc/xstartup
#!/bin/shunset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
/etc/X11/xinit/xinitrc
vncserver -kill $DISPLAY
The line at the end is killing vncserver (which is trange), remove that line:
$ cat /home/oracle/.vnc/xstartup
#!/bin/shunset SESSION_MANAGER
unset DBUS_SESSION_BUS_ADDRESS
/etc/X11/xinit/xinitrc
Start VNC:
$ vncserver -geometry 1024×1024
New ‘stbyracq.example.com:1 (oracle)’ desktop is stbyracq.example.com:1
Starting applications specified in /home/oracle/.vnc/xstartup
Log file is /home/oracle/.vnc/stbyracq.example.com:1.log
Check VNC process:
ps -ef|grep vnc
oracle 22690 1 0 16:40 pts/1 00:00:00 /bin/Xvnc :1 -auth /home/oracle/.Xauthority -desktop stbyracq.example.com:1 (oracle) -fp catalogue:/etc/X11/fontpath.d -geometry 1024×1024 -pn -rfbauth /home/oracle/.vnc/passwd -rfbport 5901 -rfbwait 30000
oracle 23106 20841 0 16:41 pts/1 00:00:00 grep –color=auto vnc
Now you can connect to VNC server.
December 10, 2018 Leave a comment
Problem:
VNC server starts successfully, but then stops immediately.
# vncserver
New ‘primrac1.example.com:1 (root)’ desktop is primrac1.example.com:1
Starting applications specified in /root/.vnc/xstartup
Log file is /root/.vnc/primrac1.example.com:1.log
The following output is empty:
# ps -ef|grep vnc|grep -v grep
Troubleshooting
Check the log file for more information:
# cat /root/.vnc/primrac1.example.com:1.log
…
/usr/bin/xterm: cannot load font ‘-misc-fixed-medium-r-semicondensed–13-120-75-75-c-60-iso10646-1’
Solution:
# yum install xorg-x11-fonts* -y
November 27, 2018 Leave a comment
Action:
I have deleted tigervnc rpm and was trying to reinstall it but got the following error:
yum install tigervnc*
https://rhui-3.microsoft.com...x86_64/dotnet/1/debug/repodata/repomd.xml: [Errno 14] curl#58 - "SSL peer rejected your certificate as expired."
Trying other mirror.
Actually, the problem is not related to tigervnc only, it is global. During this time I was not able to run yum update or any installation using yum.
Causes:
Red Hat Update Infrastructure (RHUI) certificate has expired and it needs to be updated.
Solution:
Update RHUI certificate using the following rpm:
For RHEL 7:
# curl -o azureclient.rpm https://rhui-1.microsoft.com/pulp/repos/microsoft-azure-rhel7/rhui-azure-rhel7-2.2-74.noarch.rpm
# sudo rpm -U azureclient.rpm
For RHEL 6:
# curl -o azureclient.rpm https://rhui-1.microsoft.com/pulp/repos/microsoft-azure-rhel6/rhui-azure-rhel6-2.2-74.noarch.rpm
# sudo rpm -U azureclient.rpm
August 24, 2018 Leave a comment
There are several ways to download files from Oracle site.
We will use one of the methods to download Oracle Proactive Bundle Patch on the Linux machine.
First of all, find the desired file and copy its link address:
Run WGET by passing the following parameters:
# wget --http-user=mariam.kupa@gmail.com --ask-password "https://updates.oracle.com/Orion/Services/download/p27968010_121020_Linux-x86-64.zip?aru=22331652&patch_file=p27968010_121020_Linux-x86-64.zip" -O p27968010_121020_Linux-x86-64.zip Password:
That’s it!
