How To Install nss_wrapper on CentOS 8

nss_wrapper is A wrapper for the user, group and hosts NSS API A wrapper for the user, group and hosts NSS API

Introduction

In this tutorial we learn how to install nss_wrapper on CentOS 8.

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. nss_wrapper 1.1.5 3.el8 x86_64 43 k nss_wrapper-1.1.5-3.el8.src.rpm appstream A wrapper for the user, group and hosts NSS API https BSD 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 8. 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 8 Using dnf

Update yum database with dnf using the following command.

sudo dnf makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install nss_wrapper using dnf by running the following command:

sudo dnf -y install nss_wrapper

Install nss_wrapper on CentOS 8 Using yum

Update yum database with yum using the following command.

sudo yum makecache --refresh

The output should look something like this:

CentOS Linux 8 - AppStream                                       43 kB/s | 4.3 kB     00:00    
CentOS Linux 8 - BaseOS                                          65 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - ContinuousRelease                               43 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - Extras                                          23 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - FastTrack                                       40 kB/s | 3.0 kB     00:00    
CentOS Linux 8 - HighAvailability                                36 kB/s | 3.9 kB     00:00    
CentOS Linux 8 - Plus                                            24 kB/s | 1.5 kB     00:00    
CentOS Linux 8 - PowerTools                                      50 kB/s | 4.3 kB     00:00    
Extra Packages for Enterprise Linux Modular 8 - x86_64           13 kB/s | 9.2 kB     00:00    
Extra Packages for Enterprise Linux 8 - x86_64                   24 kB/s | 8.5 kB     00:00    
Metadata cache created.

After updating yum database, We can install nss_wrapper using yum by running the following command:

sudo yum -y install nss_wrapper

How To Uninstall nss_wrapper on CentOS 8

To uninstall only the nss_wrapper package we can use the following command:

sudo dnf remove nss_wrapper

nss_wrapper Package Contents on CentOS 8

/usr/bin/nss_wrapper.pl
/usr/lib/.build-id
/usr/lib/.build-id/cc
/usr/lib/.build-id/cc/53c51a3232d4a83834ce94fee6a40205d1a22c
/usr/lib64/cmake/nss_wrapper
/usr/lib64/cmake/nss_wrapper/nss_wrapper-config-version.cmake
/usr/lib64/cmake/nss_wrapper/nss_wrapper-config.cmake
/usr/lib64/libnss_wrapper.so
/usr/lib64/libnss_wrapper.so.0
/usr/lib64/libnss_wrapper.so.0.2.5
/usr/lib64/pkgconfig/nss_wrapper.pc
/usr/share/doc/nss_wrapper
/usr/share/doc/nss_wrapper/AUTHORS
/usr/share/doc/nss_wrapper/ChangeLog
/usr/share/doc/nss_wrapper/README
/usr/share/licenses/nss_wrapper
/usr/share/licenses/nss_wrapper/LICENSE
/usr/share/man/man1/nss_wrapper.1.gz
/usr/bin/nss_wrapper.pl
/usr/lib/.build-id
/usr/lib/.build-id/fd
/usr/lib/.build-id/fd/a2309919f390fa2ecf25e2378f70d3a733716c
/usr/lib/cmake/nss_wrapper
/usr/lib/cmake/nss_wrapper/nss_wrapper-config-version.cmake
/usr/lib/cmake/nss_wrapper/nss_wrapper-config.cmake
/usr/lib/libnss_wrapper.so
/usr/lib/libnss_wrapper.so.0
/usr/lib/libnss_wrapper.so.0.2.5
/usr/lib/pkgconfig/nss_wrapper.pc
/usr/share/doc/nss_wrapper
/usr/share/doc/nss_wrapper/AUTHORS
/usr/share/doc/nss_wrapper/ChangeLog
/usr/share/doc/nss_wrapper/README
/usr/share/licenses/nss_wrapper
/usr/share/licenses/nss_wrapper/LICENSE
/usr/share/man/man1/nss_wrapper.1.gz

References

Summary

In this tutorial we learn how to install nss_wrapper on CentOS 8 using yum and dnf.