On 9 Jun 2017, at 11:46, Sandro Bonazzola <sbonazzo@redhat.com> wrote: =20 =20 =20 On Fri, Jun 9, 2017 at 11:05 AM, Fabrice Bacchella = <fabrice.bacchella@orange.fr <mailto:fabrice.bacchella@orange.fr>> = wrote: I haven't switched from ntp to chrony. So I have configured my puppet = to remove it as it's now part of default installation of rhel. =20 I works well with everything except on vdsm, since last upgrade: =20 # yum erase chrony .. Removing for dependencies: vdsm x86_64 = 4.19.15-1.el7.centos = @ovirt-4.1 2.6 M vdsm-hook-vmfex-dev noarch = 4.19.15-1.el7.centos = @ovirt-4.1 21 k =20 =20 Why vdsm depends on chrony ? Any time synchronisation solution is = good. Is that the role of ovirt to chose for me ? =20 Adding people involved in this change. Please note the change has been reviewed and discussed on = https://gerrit.ovirt.org/#/c/73822/ = <https://gerrit.ovirt.org/#/c/73822/> for addressing = https://bugzilla.redhat.com/show_bug.cgi?id=3D1428419 = <https://bugzilla.redhat.com/show_bug.cgi?id=3D1428419> and it moves from requiring ntp to requiring chrony. So it was already deciding for you, you just both were in agreement = :-) =20 Sadly: # rpm -q --provides ntp config(ntp) =3D 4.2.8p10-1.fc26 ntp =3D 4.2.8p10-1.fc26 ntp(x86-64) =3D 4.2.8p10-1.fc26 =20 rpm -q --provides chrony chrony =3D 3.1-4.fc26 chrony(x86-64) =3D 3.1-4.fc26 config(chrony) =3D 3.1-4.fc26 =20 there's no way to require just the time synchronization capability =
=20 # rpm -q --provides httpd config(httpd) =3D 2.4.25-8.fc26 httpd =3D 2.4.25-8.fc26 httpd(x86-64) =3D 2.4.25-8.fc26 httpd-mmn =3D 20120211 httpd-mmn =3D 20120211x8664 httpd-suexec =3D 2.4.25-8.fc26 mod_dav =3D 2.4.25-8.fc26 webserver =20 # dnf provides webserver Ultima verifica della scadenza dei metadati: 0:02:59 fa il Fri Jun 09 = 11:36:58 2017 CEST. httpd-2.4.25-8.fc26.x86_64 : Apache HTTP Server Repo : @System =20 nginx-1:1.10.3-1.fc26.x86_64 : A high performance web server and = reverse proxy server Repo : @System =20 httpd-2.4.25-8.fc26.x86_64 : Apache HTTP Server Repo : updates-testing =20 cherokee-1.2.104-1.fc25.i686 : Flexible and Fast Webserver Repo : fedora =20 cherokee-1.2.104-1.fc25.x86_64 : Flexible and Fast Webserver Repo : fedora =20 httpd-2.4.25-5.fc26.x86_64 : Apache HTTP Server Repo : fedora =20 lighttpd-1.4.45-3.fc26.x86_64 : Lightning fast webserver with light = system requirements Repo : fedora =20 nginx-1:1.10.3-1.fc26.x86_64 : A high performance web server and = reverse proxy server Repo : fedora =20 In Fedora we may use boolean dependencies and install chrony only if = ntp is not already installed: = http://rpm.org/user_doc/boolean_dependencies.html = <http://rpm.org/user_doc/boolean_dependencies.html> but this feature is not available in RHEL / CentOS. =20 I let others explain why we are enforcing the dependency on the =
--Apple-Mail=_79B419BC-A1BC-4C24-A890-BDFCFE15431C Content-Transfer-Encoding: quoted-printable Content-Type: text/plain; charset=utf-8 like in httpd providing the webserver capability: package itself instead of moving vdsm to an error state if time = synchronization is disabled at runtime: because it=E2=80=99s much more problematic to troubleshoot and fix then. The main reason is by enforcing NTP service on the host we get a good = time sync even for people who do not care/do not know anything about it = and get the right setup from DHCP As Sandro says there is no easy way to identify the capability in = general, and chrony is the default in el7 You can just disable the chrony service(we rely on the fact it=E2=80=99s = enabled by default) and install any other NTP service as you prefer Thanks, micahl
=20 # timedatectl status Local time: ven 2017-06-09 11:45:18 CEST Universal time: ven 2017-06-09 09:45:18 UTC RTC time: ven 2017-06-09 09:45:18 Time zone: Europe/Rome (CEST, +0200) Network time on: yes NTP synchronized: yes RTC in local TZ: no =20 # rpm -qf `which timedatectl` systemd-233-3.fc26.x86_64 =20 =20 =20 =20 _______________________________________________ Users mailing list Users@ovirt.org <mailto:Users@ovirt.org> http://lists.ovirt.org/mailman/listinfo/users = <http://lists.ovirt.org/mailman/listinfo/users> =20 =20 =20 --=20 SANDRO BONAZZOLA ASSOCIATE MANAGER, SOFTWARE ENGINEERING, EMEA ENG VIRTUALIZATION R&D Red Hat=C2=A0EMEA <https://www.redhat.com/> <https://red.ht/sig>=09 TRIED. TESTED. TRUSTED. <https://redhat.com/trusted>
--Apple-Mail=_79B419BC-A1BC-4C24-A890-BDFCFE15431C Content-Transfer-Encoding: quoted-printable Content-Type: text/html; charset=utf-8 <html><head><meta http-equiv=3D"Content-Type" content=3D"text/html = charset=3Dutf-8"></head><body style=3D"word-wrap: break-word; = -webkit-nbsp-mode: space; -webkit-line-break: after-white-space;" = class=3D""><br class=3D""><div><blockquote type=3D"cite" class=3D""><div = class=3D"">On 9 Jun 2017, at 11:46, Sandro Bonazzola <<a = href=3D"mailto:sbonazzo@redhat.com" class=3D"">sbonazzo@redhat.com</a>>= wrote:</div><br class=3D"Apple-interchange-newline"><div class=3D""><div = dir=3D"ltr" class=3D""><br class=3D""><div class=3D"gmail_extra"><br = class=3D""><div class=3D"gmail_quote">On Fri, Jun 9, 2017 at 11:05 AM, = Fabrice Bacchella <span dir=3D"ltr" class=3D""><<a = href=3D"mailto:fabrice.bacchella@orange.fr" target=3D"_blank" = class=3D"">fabrice.bacchella@orange.fr</a>></span> wrote:<br = class=3D""><blockquote class=3D"gmail_quote" style=3D"margin:0px 0px 0px = 0.8ex;border-left:1px solid rgb(204,204,204);padding-left:1ex">I haven't = switched from ntp to chrony. So I have configured my puppet to remove it = as it's now part of default installation of rhel.<br class=3D""> <br class=3D""> I works well with everything except on vdsm, since last upgrade:<br = class=3D""> <br class=3D""> # yum erase chrony<br class=3D""> ..<br class=3D""> Removing for dependencies:<br class=3D""> vdsm = = x86_64 = = 4.19.15-1.el7.centos = = @ovirt-4.1 = 2.6 M<br = class=3D""> vdsm-hook-vmfex-dev = = noarch = = 4.19.15-1.el7.centos = = @ovirt-4.1 = 21 k<br = class=3D""> <br class=3D""> <br class=3D""> Why vdsm depends on chrony ? Any time synchronisation solution is good. = Is that the role of ovirt to chose for me ?<br = class=3D""></blockquote><div class=3D""><br class=3D""></div><div = class=3D"">Adding people involved in this change.</div><div = class=3D"">Please note the change has been reviewed and discussed on <a = href=3D"https://gerrit.ovirt.org/#/c/73822/" = class=3D"">https://gerrit.ovirt.org/#/c/73822/</a> for = addressing <a = href=3D"https://bugzilla.redhat.com/show_bug.cgi?id=3D1428419" = class=3D"">https://bugzilla.redhat.com/show_bug.cgi?id=3D1428419</a></div>= <div class=3D"">and it moves from requiring ntp to requiring = chrony.</div><div class=3D"">So it was already deciding for you, you = just both were in agreement :-)</div><div class=3D""><br = class=3D""></div><div class=3D"">Sadly:</div><div class=3D""><div = class=3D""># rpm -q --provides ntp</div><div class=3D"">config(ntp) =3D = 4.2.8p10-1.fc26</div><div class=3D"">ntp =3D 4.2.8p10-1.fc26</div><div = class=3D"">ntp(x86-64) =3D 4.2.8p10-1.fc26</div></div><div class=3D""><br = class=3D""></div><div class=3D""><div class=3D"">rpm -q --provides = chrony</div><div class=3D"">chrony =3D 3.1-4.fc26</div><div = class=3D"">chrony(x86-64) =3D 3.1-4.fc26</div><div = class=3D"">config(chrony) =3D 3.1-4.fc26</div></div><div class=3D""><br = class=3D""></div><div class=3D"">there's no way to require just the time = synchronization capability like in httpd providing the webserver = capability:</div><div class=3D""><br class=3D""></div><div class=3D""><div= class=3D""># rpm -q --provides httpd</div><div class=3D"">config(httpd) = =3D 2.4.25-8.fc26</div><div class=3D"">httpd =3D 2.4.25-8.fc26</div><div = class=3D"">httpd(x86-64) =3D 2.4.25-8.fc26</div><div class=3D"">httpd-mmn = =3D 20120211</div><div class=3D"">httpd-mmn =3D 20120211x8664</div><div = class=3D"">httpd-suexec =3D 2.4.25-8.fc26</div><div class=3D"">mod_dav =3D= 2.4.25-8.fc26</div><div class=3D"">webserver</div></div><div = class=3D""><br class=3D""></div><div class=3D""><div class=3D""># dnf = provides webserver</div><div class=3D"">Ultima verifica della scadenza = dei metadati: 0:02:59 fa il Fri Jun 09 11:36:58 2017 CEST.</div><div = class=3D"">httpd-2.4.25-8.fc26.x86_64 : Apache HTTP Server</div><div = class=3D"">Repo : @System</div><div = class=3D""><br class=3D""></div><div = class=3D"">nginx-1:1.10.3-1.fc26.x86_64 : A high performance web server = and reverse proxy server</div><div class=3D"">Repo = : @System</div><div class=3D""><br class=3D""></div><div = class=3D"">httpd-2.4.25-8.fc26.x86_64 : Apache HTTP Server</div><div = class=3D"">Repo : updates-testing</div><div = class=3D""><br class=3D""></div><div = class=3D"">cherokee-1.2.104-1.fc25.i686 : Flexible and Fast = Webserver</div><div class=3D"">Repo : = fedora</div><div class=3D""><br class=3D""></div><div = class=3D"">cherokee-1.2.104-1.fc25.x86_64 : Flexible and Fast = Webserver</div><div class=3D"">Repo : = fedora</div><div class=3D""><br class=3D""></div><div = class=3D"">httpd-2.4.25-5.fc26.x86_64 : Apache HTTP Server</div><div = class=3D"">Repo : fedora</div><div = class=3D""><br class=3D""></div><div = class=3D"">lighttpd-1.4.45-3.fc26.x86_64 : Lightning fast webserver with = light system requirements</div><div class=3D"">Repo = : fedora</div><div class=3D""><br class=3D""></div><div = class=3D"">nginx-1:1.10.3-1.fc26.x86_64 : A high performance web server = and reverse proxy server</div><div class=3D"">Repo = : fedora</div></div><div class=3D""><br class=3D""></div><div = class=3D"">In Fedora we may use boolean dependencies and install chrony = only if ntp is not already installed: <a = href=3D"http://rpm.org/user_doc/boolean_dependencies.html" = class=3D"">http://rpm.org/user_doc/boolean_dependencies.html</a></div><div= class=3D"">but this feature is not available in RHEL / = CentOS.</div><div class=3D""><br class=3D""></div><div class=3D"">I let = others explain why we are enforcing the dependency on the package itself = instead of moving vdsm to an error state if time synchronization is = disabled at runtime:</div></div></div></div></div></blockquote><div><br = class=3D""></div>because it=E2=80=99s much more problematic to = troubleshoot and fix then.</div><div>The main reason is by enforcing NTP = service on the host we get a good time sync even for people who do not = care/do not know anything about it and get the right setup from = DHCP</div><div>As Sandro says there is no easy way to identify the = capability in general, and chrony is the default in el7</div><div><br = class=3D""></div><div>You can just disable the chrony service(we rely on = the fact it=E2=80=99s enabled by default) and install any other NTP = service as you prefer</div><div><br = class=3D""></div><div>Thanks,</div><div>micahl</div><div><br = class=3D""><blockquote type=3D"cite" class=3D""><div class=3D""><div = dir=3D"ltr" class=3D""><div class=3D"gmail_extra"><div = class=3D"gmail_quote"><div class=3D""><br class=3D""></div><div = class=3D""><div class=3D""># timedatectl status</div><div = class=3D""> Local time: ven 2017-06-09 11:45:18 = CEST</div><div class=3D""> Universal time: ven 2017-06-09 09:45:18 = UTC</div><div class=3D""> RTC time: ven = 2017-06-09 09:45:18</div><div class=3D""> Time = zone: Europe/Rome (CEST, +0200)</div><div class=3D""> Network time = on: yes</div><div class=3D"">NTP synchronized: yes</div><div = class=3D""> RTC in local TZ: no</div></div><div class=3D""><br = class=3D""></div><div class=3D""><div class=3D""># rpm -qf `which = timedatectl`</div><div = class=3D"">systemd-233-3.fc26.x86_64</div></div><div class=3D""><br = class=3D""></div><div class=3D""><br class=3D""></div><div = class=3D""> </div><blockquote class=3D"gmail_quote" = style=3D"margin:0px 0px 0px 0.8ex;border-left:1px solid = rgb(204,204,204);padding-left:1ex"> <br class=3D""> ______________________________<wbr class=3D"">_________________<br = class=3D""> Users mailing list<br class=3D""> <a 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