<div dir="ltr">Template creation fails if /var/tmp is xfs, which is the default file system on RHEL7.  The documentation for installation does not highlight this requirement for /var/tmp; it does for /vz though.  Reference:<div><a href="https://openvz.org/Quick_installation">https://openvz.org/Quick_installation</a><br><div><br></div><div>Here is the full output.  Resolved by formatting /var/tmp with ext4 instead of xfs.</div><div><br></div><div>My version:</div><div><div>[root@cluster-02 ~]# rpm -q vztt</div><div>vztt-7.0.28-1.vz7.x86_64</div></div><div><br></div><div><div>[root@cluster-02 ~]# vzpkg update cache centos-7-x86_64</div><div>Update OS template cache for centos-7-x86_64 template</div><div>Cleaning repos: base0 base1 base2 base3</div><div>0 metadata files removed</div><div>0 sqlite files removed</div><div>0 metadata files removed</div><div>base0                                                                                                           |  951 B  00:00:00</div><div>base1                                                                                                           |  951 B  00:00:00</div><div>base2                                                                                                           | 3.6 kB  00:00:00</div><div>base3                                                                                                           | 3.4 kB  00:00:00</div><div>(1/8): base2/group_gz                                                                                           | 155 kB  00:00:00</div><div>(2/8): base3/filelists_db                                                                                       | 1.5 MB  00:00:00</div><div>(3/8): base3/primary_db                                                                                         | 2.3 MB  00:00:00</div><div>(4/8): base2/primary_db                                                                                         | 5.3 MB  00:00:01</div><div>(5/8): base3/prestodelta                                                                                        | 161 kB  00:00:00</div><div>(6/8): base2/filelists_db                                                                                       | 6.2 MB  00:00:01</div><div>(7/8): base2/other_db                                                                                           | 2.3 MB  00:00:03</div><div>(8/8): base3/other_db                                                                                           |  19 MB  00:00:02</div><div>(1/6): base0/filelists                                                                                          |  326 B  00:00:00</div><div>(2/6): base0/primary                                                                                            |  723 B  00:00:00</div><div>(3/6): base0/other                                                                                              |  309 B  00:00:00</div><div>(4/6): base1/filelists                                                                                          |  150 B  00:00:00</div><div>(5/6): base1/primary                                                                                            |  157 B  00:00:00</div><div>(6/6): base1/other                                                                                              |  145 B  00:00:00</div><div>base0                                                                                                                              1/1</div><div>base0                                                                                                                              1/1</div><div>base0                                                                                                                              1/1</div><div>Metadata Cache Created</div><div>Cleaning repos: docker0</div><div>0 metadata files removed</div><div>0 sqlite files removed</div><div>0 metadata files removed</div><div>docker0                                                                                                         | 3.4 kB  00:00:00</div><div>(1/4): docker0/filelists_db                                                                                     | 246 kB  00:00:00</div><div>(2/4): docker0/other_db                                                                                         | 256 kB  00:00:00</div><div>(3/4): docker0/primary_db                                                                                       |  90 kB  00:00:00</div><div>(4/4): docker0/prestodelta                                                                                      |  16 kB  00:00:01</div><div>Metadata Cache Created</div><div>Error: Failed to create ploop image /var/tmp//vzpkg.vrDKJ9/cache-private/root.hdd/root.hds: Error in add_delta (ploop.c:1345): Can&#39;t add image /var/tmp//vzpkg.vrDKJ9/cache-private/root.hdd/root.hds: unsupported underlying filesystem 3</div><div>Error: Cannot create ploop device</div></div><div><br></div></div></div>