How To Install nss_wrapper on CentOS 7
Introduction
In this tutorial we learn how to install nss_wrapper on CentOS 7.
What is nss_wrapper
There are projects which provide daemons needing to be able to create, modify and delete Unix users. Or just switch user ids to interact with the system e.g. a user space file server. To be able to test that you need the privilege to modify the passwd and groups file. With nss_wrapper it is possible to define your own passwd and groups file which will be used by software to act correctly while under test. If you have a client and server under test they normally use functions to resolve network names to addresses (dns) or vice versa. The nss_wrappers allow you to create a hosts file to setup name resolution for the addresses you use with socket_wrapper. To use it set the following environment variables LD_PRELOAD=libuid_wrapper.so NSS_WRAPPER_PASSWD=/path/to/passwd NSS_WRAPPER_GROUP=/path/to/group NSS_WRAPPER_HOSTS=/path/to/host This package doesn’t have a devel package cause this project is for development/testing.
We can use yum or dnf to install nss_wrapper on CentOS 7. In this tutorial we discuss both methods but you only need to choose one of method to install nss_wrapper.
Install nss_wrapper on CentOS 7 Using yum
Update yum database with yum using the following command.
sudo yum makecache
After updating yum database, We can install nss_wrapper using yum by running the following command:
sudo yum -y install nss_wrapper
Install nss_wrapper on CentOS 7 Using dnf
If you don’t have dnf installed you can install DNF on CentOS 7 first.
Update yum database with dnf using the following command.
sudo dnf makecache
After updating yum database, We can install nss_wrapper using dnf by running the following command:
sudo dnf -y install nss_wrapper
How To Uninstall nss_wrapper on CentOS 7
To uninstall only the nss_wrapper package we can use the following command:
sudo dnf remove nss_wrapper
References
Summary
In this tutorial we learn how to install nss_wrapper on CentOS 7 using yum and dnf.
