Somehow /root directory is missing(not mounted) in my rhel Linux box.
Can anyone suggest how to re-mount /root?
bash-3.1# cat /etc/redhat-release
Red Hat Enterprise Linux Server release 5.1 (Tikanga).
Often /root will simply be a subdirectory of /
Have a look at the last column of df /root The output on my machine indicates that /root is a subdirectory of /
If /root is missing the solution may be as simple as logging as root for the first time or running a mkdir /root
Related
I am using Ubuntu windows 10 bash and I'd like to move a project from /mnt/i/Projects/Template to run it on Apache server which located in /var/www/html.
I tried to copy a folder from a direct to new directly but unfortunately I got an error which is:
cp -r /mnt/i/Projects/Template ~/var/www/html/
cp: target '/root/var/www/html/' is not a directory
I would like to test those templates with Apache and I tried to change Apache directly.
Another test I did:
root#DESKTOP-4PBGG1N:/var/www# ls -ld ~/var ~/var/www ~/var/www/html
ls: cannot access '/root/var': No such file or directory
ls: cannot access '/root/var/www': No such file or directory
ls: cannot access '/root/var/www/html': No such file or directory
First of all the directory for the apache server is not in root it's just "/var/www/html". If it still doesn't work you probably doesn't have apache installed, you can do that by running these two lines "lsb_release -a" and "sudo apt-get install apache2". There will come an error when trying to launch the apache server (with "sudo service apache2 start"), but just ignore it you can still use it without any problems. Hope it helps ;)
try creating directory if the only problem is '/root/var/www/html/' not being a directory
# mkdir -pv ~/var/www/html/
# cp -r /mnt/i/Projects/Template ~/var/www/html/
before that just make sure that apache is installed and configured
have a nice day
For instance you have a file in Documents called index.php and to be copied in the /root/var/www/html/ directory you have to do it this way:
First don't forget to use sudo to be super user and then
- sudo cp -Rv index.php /var/www/html or
- sudo cp -Rv index.php /root/var/www/html
And you will get this output: 'index.php' -> '/var/www/html/index.php'
-R for copy folders &
-v for see what folders and files are copied
I have a question, I created a script but I need to create a path, to find my cassandra folder to execute cqlsh, this is the route
C:/apache-cassandra-3.11.4/bin/cqlsh
the problem is because I am in windows not in linux, and I want to see if possible to create an a path in case that I need to pass my script to my team. but you know your cassandra db is in another route for that reason I want to do that because I need to execute this script
example
route= /../cassandra3.11.4/bin/cqlsh
$route -k fsainstqual -e "TRUNCATE instrumentmanufacturer"
If you mean you don't know how to mix Windows drive letters and Linux directory handling (which does not have drives), you'll need mounting points, as you can see in following mount excerpt on my PC, where I have a Linux app installed:
Prompt>mount
...
C: on /mnt/c type drvfs (rw,noatime,uid=1000,gid=1000,case=off)
E: on /mnt/e type drvfs (rw,noatime,uid=1000,gid=1000,case=off)
In top of that, on my root directory, I've created symlinks to those mounted directories:
Prompt>cd /
Prompt>$ ls -ltra | grep "\->"
lrwxrwxrwx 2 root root 6 Nov 23 2017 C -> /mnt/c
lrwxrwxrwx 2 root root 6 Nov 14 12:00 E -> /mnt/e
I think it's better to clarify your question buddy.
If you want to change your current directory, you can use "cd" command as in linux shell.
If you want to create a path use "md" or "mkdir" command.
Here is the help in windows OS
https://learn.microsoft.com/en-us/windows-server/administration/windows-commands/md
physical Host = Ubuntu 18.04;
virtual Guest (VirtualBox) = Win 7 with installed Cygwin, Access to Host by Shared Folders of Virtualbox.
The above environment is working.
I use a shell script in Cygwin to save some files to the physical host. That works also.
Strange thing: when i start the same script by cron under Cygwin the mounted directories (shared folders) are not found / known by cron, only /cydrive/c is known.
Where is the issue? Virtualbox? cygwin? cron?
Thanks for any advise.
#not2qubit
crontab:
*/15 * * * * /home/sepp/my_backup_dubai
my_backup_dubai:
#!/usr/bin/csh
if (! -d /tmp/Backup) mkdir /tmp/Backup
rsync -avi --delete --delete-excluded --exclude-from=/home/sepp/list.dubai / /tmp/Backup
crontab -l >/tmp/Backup/crontab
tar czvf /cygdrive/z/Cloud/ownCloud/tmp/vmdubai.tgz /tmp/Backup
the issue is /cygdrive/z/.... this is not executed!?
this happens when I have
an executable that is in the /tmp directory (say /tmp/a.out)
it is run by a root shell
linux
selinux on (default for RedHat, CentOS, etc)
Apparently trying to run an executable that sits in the /tmp/directory as root revokes the privileges. Any idea how to go around this issue, other than turning off selinux? Thanks
You can set file context on binary or directory (containing binary) that are in /tmp that you want to run.
sudo semanage fcontext -a -t bin_t /tmp/location
Then restorecon:
sudo restorecon -vR /tmp/location
Just have a look at the mount options for /tmp directory, most probably you have no-exec option on it (there are many security reasons of doing that, the first being that anyone can put a file in the /tmp directory)
Produces the following command on Ubuntu 64bit on VMWare:
mount /dev/sda1 /newroot
cd /newroot
mkdir old-root
pivot_root . old-root
I get an error that I do not understand
pivot_root: device or resource busy
Any ideas?
I saw the same error when the new root directory is a plain directory. When the new root is a mount, it will be ok. A bind mount of a directory is ok too. Also need to make sure the root directory permission is 0755, and owned by the root user.
The related answer states that you need to umount /proc first. I do not see the same.
The host ubnutu is 16.04 and it pivots into 18.04. Used unshare -m -p -f /bin/bash, followed by pivot_root . old_root. The -f is necessary to avoid a memory allocation error.