# Percona-xtrabackup-84 cannot be installed on Rocky Linux 9.7 with Percona Server 8.4 (missing libmysqlclient.so.21)

**URL:** <https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150>\
**Category:** Percona XtraBackup\
**Created:** [February 4, 2026, 12:09pm UTC](https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150 "2026-02-04T12:09:29Z")\
**Posts on this page:** 5\
**Page:** 1

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**Author:** ![Simeon\_Petkov](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@Simeon\_Petkov](https://forums.percona.com/u/Simeon_Petkov)\
**Post date:** [February 4, 2026, 12:09pm UTC](https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150/1 "2026-02-04T12:09:29Z")

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**Environment:**  
OS: Rocky Linux 9.7  
Percona Server: 8.4 (ps-84-lts)  
ps-84-lts → enabled  
pxb-84-lts → enabled  
ps-80 → disabled (normal configuration after upgrade)

We have upgraded our database servers from Percona Server 8.0 to Percona Server 8.4.  
After the database upgrade, we wanted to install the matching backup tool: percona-xtrabackup-84  
However, xtrabackup 8.4 cannot be installed due to an unsatisfied dependency:

In short:

- percona-xtrabackup-84 requires: perl(DBD::mysql) but on Rocky 9.7, the only provider is: perl-DBD-MySQL (from AppStream) - and it depends on libmysqlclient.so.21

- Percona Server 8.4 provides only: libmysqlclient.so.22 - and explicitly obsoletes the distro mysql-libs package - As a result, xtrabackup 8.4 cannot be installed with Percona Server 8.4 on Rocky 9.7.

- If we temporarily enable the Percona 8.0 repository (ps-80) and retry the installation, DNF proposes to downgrade percona-server-shared to 8.0.x in order to get libmysqlclient.so.21.

**What is the recommended and supported solution for this on Rocky / RHEL 9? Thanks!**

**Output for DNF command:**  
dnf install percona-xtrabackup-84.x86\_64

Error:  
Problem: package perl-DBD-MySQL-4.053-1.el9.0.1.x86\_64 from appstream requires libmysqlclient.so.21()(64bit), but none of the providers can be installed

- package perl-DBD-MySQL-4.053-1.el9.0.1.x86\_64 from appstream requires libmysqlclient.so.21(libmysqlclient\_21.0)(64bit), but none of the providers can be installed
- package percona-server-shared-8.4.0-1.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.0-1.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.0-1.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.0-1.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- problem with installed package percona-server-shared-8.4.7-7.1.el9.x86\_64
- package percona-server-shared-8.4.2-2.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.2-2.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.2-2.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.2-2.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- package percona-xtrabackup-84-8.4.0-5.1.el9.x86\_64 from pxb-84-lts-release-x86\_64 requires perl(DBD::mysql), but none of the providers can be installed
- cannot install the best candidate for the job
- package percona-server-shared-8.4.3-3.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.3-3.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.3-3.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.3-3.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- package percona-server-shared-8.4.4-4.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.4-4.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.4-4.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.4-4.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- package percona-server-shared-8.4.5-5.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.5-5.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.5-5.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.5-5.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- package percona-server-shared-8.4.6-6.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.6-6.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.6-6.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.6-6.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- package percona-server-shared-8.4.7-7.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.7-7.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- package percona-server-shared-8.4.7-7.1.el9.x86\_64 from ps-84-lts-release-x86\_64 obsoletes mysql-libs \< 8.4.7-7.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream
- installed package percona-server-shared-8.4.7-7.1.el9.x86\_64 obsoletes mysql-libs \< 8.4.7-7.1.el9 provided by mysql-libs-8.0.43-1.el9\_6.x86\_64 from appstream
- installed package percona-server-shared-8.4.7-7.1.el9.x86\_64 obsoletes mysql-libs \< 8.4.7-7.1.el9 provided by mysql-libs-8.0.44-1.el9\_7.x86\_64 from appstream  
(try to add ‘–skip-broken’ to skip uninstallable packages or ‘–nobest’ to use not only best candidate packages)

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<div class="post-metadata">

**Author:** ![dogs\_Cute](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/dogs_cute/32/12754_2.png) [@dogs\_Cute](https://forums.percona.com/u/dogs_Cute)\
**Post date:** [February 4, 2026, 12:11pm UTC](https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150/2 "2026-02-04T12:11:39Z")

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try ln -s libmysqlclient.so.22 libmysqlclient.so.21

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**Author:** ![Simeon\_Petkov](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@Simeon\_Petkov](https://forums.percona.com/u/Simeon_Petkov)\
**Post date:** [February 4, 2026, 1:06pm UTC](https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150/3 "2026-02-04T13:06:21Z")

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In practice, **percona-xtrabackup-84** indirectly requires a package that provides  
`libmysqlclient.so.21` with symbol set `libmysqlclient_21.0`.

This cannot be satisfied by a filesystem symlink, because the RPM dependency requires a  
package that explicitly provides:  
libmysqlclient.so.21()(64bit)  
libmysqlclient.so.21(libmysqlclient\_21.0)(64bit)

**Here is an useful repo query i used to visualize the situation:**

=====================================  
repoquery --requires percona-xtrabackup-84  
/bin/sh  
/usr/bin/bash  
perl(DBD::mysql)  
…  
…

=====================================  
repoquery --requires perl-DBD-MySQL  
libc.so.6(GLIBC\_2.34)(64bit)  
libmysqlclient.so.21()(64bit)  
libmysqlclient.so.21(libmysqlclient\_21.0)(64bit)  
…  
…

**perl-DBD-MySQL** - this package must be able to work with libmysqlclient.so.24()(64bit)  
that the percona-server-shared 8.4.\* provides I presume.

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<div class="post-metadata">

**Author:** ![Evgeniy\_Patlan](https://sea1.discourse-cdn.com/flex019/user_avatar/forums.percona.com/evgeniy_patlan/32/41_2.png) [@Evgeniy\_Patlan](https://forums.percona.com/u/Evgeniy_Patlan)\
**Post date:** [February 4, 2026, 1:25pm UTC](https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150/4 "2026-02-04T13:25:10Z")

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please create JIra ticket about this issue as it should be properly investigated and fixed

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<div class="post-metadata">

**Author:** ![Simeon\_Petkov](https://avatars.discourse-cdn.com/v4/letter/s/7ab992/32.png) [@Simeon\_Petkov](https://forums.percona.com/u/Simeon_Petkov)\
**Post date:** [February 4, 2026, 3:19pm UTC](https://forums.percona.com/t/percona-xtrabackup-84-cannot-be-installed-on-rocky-linux-9-7-with-percona-server-8-4-missing-libmysqlclient-so-21/40150/5 "2026-02-04T15:19:27Z")

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Can you please grant me permission for ticket creation for the following mail?  
**[xXSAPXx@proton.me](mailto:xXSAPXx@proton.me)**  
**Am presuming this is the correct Jira Space:**

> **[Jira](https://perconadev.atlassian.net/jira/software/c/projects/PXB/issues?jql=project%20%3D%20PXB%20ORDER%20BY%20created%20DESC)**

Thanks!