meaning of sudo chown -R `id -u` /data/db - mongodb

This command is actually a solution for this question about mongodb issue.
But the ichiness of not knowing what exactly it is doing, command by command, is really drive me nut!
If anyone could dissect what this line does to... the /data/db directory, or even any other directory! Will be really appreciated (also those who like me, very noobie in command line)
Thanks!

The main command is chown, which itself change the owner of the files.
-R means Recursively, means, its applied to every files in the directory
the command inside ` are execute first and then give the result to previous command
id -u is a single command seperated from chown. You can try it and see the result.
in my computer
id -u
returns
myusername
so in my computer
sudo chown -R `id -u` /data/db
is same as
sudo chown -R myusername /data/db
And now because I own that directory, I can add, edit, delete files within that folders.

Related

Installing MongoDB 2022

I downloaded mongoDB and I try to use brew, it didn't work.
I try bunch of commands such as:
$ curl -O https://fastdl.mongodb.org/osx/mongodb-osx-x86_64-3.4.6.tgz
$ tar -zxvf mongodb-osx-x86_64-3.4.6.tgz
$ mkdir -p mongodb
$ cp -R -n mongodb-osx-x86_64-3.4.6/ mongodb
$ sudo mv mongodb /usr/local
Didn't work
Step 5: it says the directory is not empty or is not exist. I try to empty the directory didn't work and I try to create a different one, it didn't work.
I can't find any solution. Can someone help me, please?
I think your /usr/local folder already contains a non-empty folder named mongodb.
Refer this for details.
You can confirm it by listing out the files in it
ls /usr/local/mongodb
Maybe, you can try removing that directory as a superuser if it doesn't have any important files and continue with the installation

VS Code: NoPermissions (FileSystemError): Error: EACCES: permission denied

I'm trying to save a file called app.js on a folder called js.
Vs Code pop up this:
Failed to save 'app.js': Unable to write file 'vscode-remote://wsl+ubuntu-18.04/js/app.js'
(NoPermissions (FileSystemError): Error: EACCES: permission denied, mkdir '/js')
I tried:
sudo chown -R user /mnt/c/Users/myUser/Documents/myFolder/proyectFolder
but I still can't save this file.
Try this, fixed it for me
sudo chown -R username path
Example:
sudo chown -R emanuel /home/emanuel/test/
In the SSH terminal:
Recommended :
sudo chmod -R 777 folder_name_where_your_file_exists
or
sudo chmod -R 755 folder_name_where_your_file_exists
this works for me
sudo chown -R $USER:$USER /home/
TLDR;
If you're using a docker container, avoid making files from within the container because the owner and group permissions may cause problems with your editor (in my case VS Code)
I was running docker container for a Django project from Windows Terminal and using VS Code to edit my code.
It is a Linux file (since everything in Linux is a file) permission problem that arises because the files don't have proper user and/or group permissions. So VS Code tries to tell us that.
The problem I found only happened when I created files from within my docker container.
I would run docker exec ... bash
make new files using touch /path/to/file from the container bash
then try to edit those files on VS Code (say urls.py) only to get the scary permissions error preventing the file from saving.
I suspect that making files from within the container embellishes those files with different owner and group settings than your system would default to if you just ran the commands locally (not in the container).
Changing the file permissions with chown -hR and chgrp -hR would do the trick but to avoid the error altogether I stopped making files from within the container.
Try activating polling:
This worked for me during I tried using wsl.
The below is for individual file:
sudo chown yourUserNAme filename
For an entire directory it will be (when you write ls to terminal, you should see your directory to execute this command):
sudo chown yourUserNAme dirName
For recursive (i.e files and folders inside a folder):
sudo chown -R yourUserNAme dirName
Note: yourUserNAme is, if you do pwd under any Documents, you will see the path: /home/jhon/Documents. Here user is jhon.
Run VS Code as administrator and it will fix the problem.
https://answers.microsoft.com/en-us/windows/forum/all/error-in-vs-code-destination-directory-and-says/e70dc626-6b12-4791-a960-8b704e57098d
Install the extension Save as Root in Remote SSH in VS code.
While saving press Ctrl + Shift + P.
This open the command palette.
Search Save as Root
It is a Linux user permissions problem.
you should use the command:
sudo chown -R $USER:$USER.

Unable to determine status of lock file in the data directory

I am trying to run multiple mongod instances on the same centos machine with different config files.
I am getting following error while running the instance as a service:
sudo service mongod1 start
/var/lib/mongo1: boost::filesystem::status: Permission denied: "/var/lib/mongo1/mongod.lock"
I have added the permissions for the /var/lib/mongo1 using:
sudo chmod -R 600 /var/lib/mongo1
I also tried with 700, 755 and 777 at the end but nothing seems to work.
mongod:mongod is the owner of the folder /var/lib/mongo1
Any help is appreciated.
I know this is really late but I was struggling with this for days and just now found the fix. That being said for future users running into this issue the solution if you're using SELinux is to check the context of the default mongodb path against your own to make sure they are the same by executing
ls -dZ /var/lib/mongo/
the output should look something like this
drwxr-xr-x. mongod mongod system_u:object_r:mongod_var_lib_t:s0 /var/lib/mongo/
if it's not then you can copy it by doing
chcon -R --reference=/var/lib/mongo /your/path
the source can be found here
Maybe the lock file is missing? Which might explain why chmod isn't having the desired effect...
Try:
touch /var/mongo1/mongod.lock
chown mongod:mongod
chmod 600 /var/mongo1/mongod.lock
important :
Don't try to restart mongo using sudo as it tries to change the user to root where as /var/lib/mongodb owner is mongod:mongod
Please remember that Directories needs to have execute permission, but the files within the directories do not need to execute permission.
The following 2 commands worked for me
$ sudo chmod -R 770 /var/lib/mongo1
$ sudo find /var/lib/mongo1 -type f -exec chmod 660 {} \;
This will first give everything under /var/lib/mongo1 execute permission, and then return all the normal files to having only read and write, but not execute.

MongoDB config error

Pretext: this has been asked before and i've tried implementing several solutions from previous posters. The only thing i can seem to get working is running mongo as sudo.
I'm not exactly sure what i'm doing wrong. I'm trying to do a tutorial using mongodb and every time i try to run the software i get back an error that its in a read-only directory. I'm on a mac running OS Sierra, i can force run it with sudo but i know thats wrong. I've been searching for an answer for awhile and i have already adjusted the folder permissions to 775 and nothing, then 777, still nothing.
Any help pointing me in the right direction would be greatly appreciated!
to resolve the "warning soft rlimits to low" check out this link - https://gist.github.com/tamitutor/6a1e41eec0ce021a9718
Lets start over as you are bouncing around on what you are trying.
Open activity monitor and kill any mongod process.
Go to your terminal and type which mongo - lets say it shows you download directory
cd to that directory and you should be in the bin directory
cd /mongo download directory/bin
sudo bash
mkdir -p /data/db
chmod 777 /data
chmod 777 /data/db
ls -ld /data/db this will validate you see the data/db directory as 777
exit
You're back in your mongo bin directory - if you are in /usr/local/bin skip this part.
If you are not in /usr/local/bin you will need to copy the mongo files to /usr/local/bin
sudo bash
ls - make sure you are in the correct directory
cp * /usr/local/bin
exit
which mongo should now show /usr/local/bin
type mongod to start it
open a new terminal and type mongo to connect to the instance
I recommend downloading Robo 3T (formally RoboMongo) to quickly check that you can connect.
If you do those steps, you should have no issues connecting to your local Mongo instance.
Your mongod.conf files should be in /usr/local/etc - check there to confirm you have your local host set.
Should be like net:
bindIp:127.0.0.1

Mongodump not stored in the specific location

I am doing a mongodump, and want to store it in a specific location. So, from reading online, I can do this using the following command:
sudo mongodump -d mydbs -u user -p password -o /myfolder/mongoBackups
I am using an EC2 instance, and when I run this command from my centos home folder, this is the output I get from mongodump:
2017-01-07T16:01:42.053+0000 writing mydbs.users to
2017-01-07T16:01:42.055+0000 done dumping mydbs.users (2 documents)
However, when I cannot find the folder myfolder/mongoBackups anywhere in the specific home/centos location where I run it. Any idea why?
It's not within home/centos
It's in /myfolder/mongoBackups
Specifying an output directory of /myfolder/mongoBackups is basically putting it in a folder called myfolder on the root of the hard drive.
If you truly want the folder to be within home/centos try
sudo mongodump -d mydbs -u user -p password -o /home/centos/myfolder/mongoBackups