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Preparing containers for migration

  • Parallels Cloud Server 6.0
  • Parallels Virtuozzo Containers for Linux
  • Parallels Server


This article describes steps that will help prevent migration issues. Most migration issues can be prevented by keeping OS templates up-to-date and having valid repositories for all applications and OS EZ templates.


A container does not start after migration. A similar error is observed:

    ~# vzctl start 102
    Starting the Container ...
    Container is mounted
    Setting permissions 20002 dev 0x7d00
    Set up ioprio: 4
    Adding offline management to Container(1): 4643 8443 
    Adding IP addresses:
    Error: Unable to execute bash: No such file or directory
    Container is unmounted
    Failed to start the Container

There are other signs of this issue, such as the inability to show properties of the files in some directory:

    CT-12264-bash-4.2# ls -al /usr/bin/ | grep '\?'
    ls: cannot access /usr/bin/mailq: No such file or directory
    ls: cannot access /usr/bin/hoststat: No such file or directory
    ls: cannot access /usr/bin/praliases: No such file or directory
    ls: cannot access /usr/bin/purgestat: No such file or directory
    ls: cannot access /usr/bin/newaliases: No such file or directory
    ??????????  ? ?    ?              ?            ? hoststat
    ??????????  ? ?    ?              ?            ? mailq
    ??????????  ? ?    ?              ?            ? newaliases
    ??????????  ? ?    ?              ?            ? praliases
    ??????????  ? ?    ?              ?            ? purgestat

Or, the following command for the mounted/started container returns some output (like find: ...: No such file or directory):

    ~# find /vz/root/$CTID -xdev -ls >/dev/null

(Replace "$CTID" with the actual container's ID value.)


Before performing a migration, prepare the source and destination Hardware Nodes, as well as the container that is to be migrated:

  1. Set SCAN_PRIVATE to "yes" to assure that the vzpackages file will list all packages (and their versions) installed in the container by Virtuozzo package management tools based on existing links from the container's private area. Edit /etc/vztt/vztt.conf on both Nodes:

    ~# grep SCAN_PRIVATE /etc/vztt/vztt.conf 
    ~# sed -i 's/#SCAN_PRIVATE/SCAN_PRIVATE/' /etc/vztt/vztt.conf 
    ~# grep SCAN_PRIVATE /etc/vztt/vztt.conf 
  2. Sync packages for the container that is to be migrated:

    ~# vzpkg sync_vzpackages $CTID

    (Replace "$CTID" with the actual container ID value.)

  3. It is also useful to do vzpkg repair for the migrated container if the migration failed before this step. Usually, this command is performed automatically during migration:

    ~# vzpkg repair /vz/private/$CT_ID /etc/sysconfig/vz-scripts/$CTID.conf

    Step 3 may return this error:

        Error: The next package(s) are not available

    If this happens, it means that the listed packages are missing in the template area and that these packages are not available on the configured repositories -- for example, because these packages are from an outdated OS release.

    For example, let's assume that our container is based on the centos-5-x86_64 template:

        ~# vzpkg list 113
        centos-5-x86_64      2012-04-16 15:13:10

    The error is as follows:

        Error: The next package(s) are not available:
        samba-swat.x86_64                        0:3.0.33-3.29.el5_5
        samba-common.x86_64                      0:3.0.33-3.29.el5_5
        glibc-common.x86_64                      2.5-49.el5_5.4
        openldap.x86_64                          2.3.43-12.el5_5.2
        krb5-libs.i386                           1.6.1-36.el5_5.5
        krb5-libs.x86_64                         1.6.1-36.el5_5.5
        nss.x86_64                               3.12.6-2.el5.centos
        glibc.i686                               2.5-49.el5_5.4
        nscd.x86_64                              2.5-49.el5_5.4
        samba.x86_64                             0:3.0.33-3.29.el5_5
        dhclient.x86_64                          12:3.0.5-23.el5_5.1
        device-mapper-multipath.x86_64           0.4.7-34.el5_5.4

    All missing packages above are from the Centos 5.5 release (as seen from the el5_5 part in the package version).

    Add Centos 5.5 repositories (other repositories for CentOS can be added in the same way, replacing "5.5" with the actual release ID):

        ~# echo http://vault.centos.org/5.5/os/x86_64 >> /vz/template/centos/5/x86_64/config/os/default/repositories
        ~# echo http://vault.centos.org/5.5/updates/x86_64 >> /vz/template/centos/5/x86_64/config/os/default/repositories

    After that, vzpkg repair should be able to locate the needed packages.

    Some packages do not contain the release ID. For such packages, it is necessary to check all available repositories manually. Examples of such packages are httpd and mod_ssl.

NOTE: The instructions above work for Parallels Cloud Server, Parallels Server Bare Metal 5.0, and Parallels Virtuozzo Containers for Linux 4.6, 4.7 with containers based on EZ OS templates. For previous versions, they work only for PSBM 4.0 (latest release) and PVCfL 4.0 starting from 4.0.0-520. The command vzpkg repair can be used only if it is possible to create new containers based on the given OS template.

Cerca parole:


Failed to start the Container

Unable to execute bash

/usr/sbin/vzctl exited with code 17

app template mismatch

error migrate container.

vzctl exited with code 19

Links broken after migration

Error: Unable to execute bash: No such file or directory

'One or more rpm failed.'

vzarestore "info is not available"

pmigrate template

2897d76d56d2010f4e3a28f864d69223 eb0ea3b827d18de2329b6477e24c1d59 909d99074e442b52ce54cc7b31cf065d ca05eaf5b843fbd53589c90d7228a6df bf1c3a170005eae151f49ba2720abde9 3d9560cc94370f9e1bd9256d230e5ee8

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