[ovirt-devel] Re: OST fails, nothing provides nmstate

On Mon, Nov 25, 2019 at 6:48 PM Dominik Holler <dholler(a)redhat.com&gt; wrote: > > > > On Mon, Nov 25, 2019 at 5:16 PM Nir Soffer <nsoffer(a)redhat.com&gt; wrote: >> >> On Mon, Nov 25, 2019 at 6:05 PM Dominik Holler <dholler(a)redhat.com&gt; wrote: >> > >> > >> > >> > On Mon, Nov 25, 2019 at 4:50 PM Nir Soffer <nsoffer(a)redhat.com&gt; wrote: >> >> >> >> On Mon, Nov 25, 2019 at 11:00 AM Dominik Holler <dholler(a)redhat.com&gt; wrote: >> >> > >> >> > >> >> > >> >> > On Fri, Nov 22, 2019 at 8:57 PM Dominik Holler <dholler(a)redhat.com&gt; wrote: >> >> >> >> >> >> >> >> >> >> >> >> On Fri, Nov 22, 2019 at 5:54 PM Dominik Holler < dholler(a)redhat.com&gt; wrote: >> >> >>> >> >> >>> >> >> >>> >> >> >>> On Fri, Nov 22, 2019 at 5:48 PM Nir Soffer <nsoffer(a)redhat.com&gt; wrote: >> >> >>>> >> >> >>>> >> >> >>>> >> >> >>>> On Fri, Nov 22, 2019, 18:18 Marcin Sobczyk <msobczyk(a)redhat.com&gt; wrote: >> >> >>>>> >> >> >>>>> >> >> >>>>> >> >> >>>>> On 11/22/19 4:54 PM, Martin Perina wrote: >> >> >>>>> >> >> >>>>> >> >> >>>>> >> >> >>>>> On Fri, Nov 22, 2019 at 4:43 PM Dominik Holler < dholler(a)redhat.com&gt; wrote: >> >> >>>>>> >> >> >>>>>> >> >> >>>>>> On Fri, Nov 22, 2019 at 12:17 PM Dominik Holler < dholler(a)redhat.com&gt; wrote: >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> On Fri, Nov 22, 2019 at 12:00 PM Miguel Duarte de Mora Barroso <mdbarroso(a)redhat.com&gt; wrote: >> >> >>>>>>>> >> >> >>>>>>>> On Fri, Nov 22, 2019 at 11:54 AM Vojtech Juranek < vjuranek(a)redhat.com&gt; wrote: >> >> >>>>>>>> > >> >> >>>>>>>> > On pátek 22. listopadu 2019 9:56:56 CET Miguel Duarte de Mora Barroso wrote: >> >> >>>>>>>> > > On Fri, Nov 22, 2019 at 9:49 AM Vojtech Juranek < vjuranek(a)redhat.com&gt; >> >> >>>>>>>> > > wrote: >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > On pátek 22. listopadu 2019 9:41:26 CET Dominik Holler wrote: >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > > On Fri, Nov 22, 2019 at 8:40 AM Dominik Holler < dholler(a)redhat.com&gt; >> >> >>>>>>>> > > > > wrote: >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > > On Thu, Nov 21, 2019 at 10:54 PM Nir Soffer < nsoffer(a)redhat.com&gt; >> >> >>>>>>>> > > > > > wrote: >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > >> On Thu, Nov 21, 2019 at 11:24 PM Vojtech Juranek >> >> >>>>>>>> > > > > >> <vjuranek(a)redhat.com&gt; >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> wrote: >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > Hi, >> >> >>>>>>>> > > > > >> > OST fails (see e.g. [1]) in 002_bootstrap.check_update_host. It >> >> >>>>>>>> > > > > >> > fails >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> with >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > FAILED! => {"changed": false, "failures": [], "msg": "Depsolve >> >> >>>>>>>> > > > > >> > Error >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> occured: >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > \n Problem 1: cannot install the best update candidate for package >> >> >>>>>>>> > > > > >> > vdsm- >> >> >>>>>>>> > > > > >> > network-4.40.0-1236.git63ea8cb8b.el8.x86_64\n - nothing provides >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> nmstate >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > needed by vdsm-network-4.40.0-1271.git524e08c8a.el8.x86_64\n >> >> >>>>>>>> > > > > >> > Problem 2: >> >> >>>>>>>> > > > > >> > package vdsm-python-4.40.0-1271.git524e08c8a.el8.noarch requires >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> vdsm-network >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > = 4.40.0-1271.git524e08c8a.el8, but none of the providers can be >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> installed\n >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > - cannot install the best update candidate for package vdsm- >> >> >>>>>>>> > > > > >> > python-4.40.0-1236.git63ea8cb8b.el8.noarch\n - nothing provides >> >> >>>>>>>> > > > > >> > nmstate >> >> >>>>>>>> > > > > >> > needed by vdsm-network-4.40.0-1271.git524e08c8a.el8.x86_64\n >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> nmstate should be provided by copr repo enabled by >> >> >>>>>>>> > > > > >> ovirt-release-master. >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > I re-triggered as >> >> >>>>>>>> > > > > > https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6131 >> >> >>>>>>>> > > > > > maybe >> >> >>>>>>>> > > > > > https://gerrit.ovirt.org/#/c/104825/ >> >> >>>>>>>> > > > > > was missing >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > Looks like >> >> >>>>>>>> > > > > https://gerrit.ovirt.org/#/c/104825/ is ignored by OST. >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > maybe not. You re-triggered with [1], which really missed this patch. >> >> >>>>>>>> > > > I did a rebase and now running with this patch in build #6132 [2]. Let's >> >> >>>>>>>> > > > wait >> >> >>>>>>>> > for it to see if gerrit #104825 helps. >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > [1] https://jenkins.ovirt.org/job/standard-manual-runner/909/ >> >> >>>>>>>> > > > [2] https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6132/ >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > > Miguel, do you think merging >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > https://gerrit.ovirt.org/#/c/104495/15/common/yum-repos/ovirt-master-hos >> >> >>>>>>>> > > > > t-cq >> >> >>>>>>>> > .repo.in >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > would solve this? >> >> >>>>>>>> > > >> >> >>>>>>>> > > >> >> >>>>>>>> > > I've split the patch Dominik mentions above in two, one of them adding >> >> >>>>>>>> > > the nmstate / networkmanager copr repos - [3]. >> >> >>>>>>>> > > >> >> >>>>>>>> > > Let's see if it fixes it. >> >> >>>>>>>> > >> >> >>>>>>>> > it fixes original issue, but OST still fails in >> >> >>>>>>>> > 098_ovirt_provider_ovn.use_ovn_provider: >> >> >>>>>>>> > >> >> >>>>>>>> > https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6134 >> >> >>>>>>>> >> >> >>>>>>>> I think Dominik was looking into this issue; +Dominik Holler please confirm. >> >> >>>>>>>> >> >> >>>>>>>> Let me know if you need any help Dominik. >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> Thanks. >> >> >>>>>>> The problem is that the hosts lost connection to storage: >> >> >>>>>>> https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6134/artifact/exp... : >> >> >>>>>>> >> >> >>>>>>> 2019-11-22 05:39:12,326-0500 DEBUG (jsonrpc/5) [common.commands] /usr/bin/taskset --cpu-list 0-1 /usr/bin/sudo -n /sbin/lvm vgs --config 'devices { preferred_names=["^/dev/mapper/"] ignore_suspended_devices=1 write_cache_state=0 disable_after_error_count=3 filter=["a|^/dev/mapper/36001405107ea8b4e3ac4ddeb3e19890f$|^/dev/mapper/360014054924c91df75e41178e4b8a80c$|^/dev/mapper/3600140561c0d02829924b77ab7323f17$|^/dev/mapper/3600140582feebc04ca5409a99660dbbc$|^/dev/mapper/36001405c3c53755c13c474dada6be354$|", "r|.*|"] } global { locking_type=1 prioritise_write_locks=1 wait_for_locks=1 use_lvmetad=0 } backup { retain_min=50 retain_days=0 }' --noheadings --units b --nosuffix --separator '|' --ignoreskippedcluster -o uuid,name,attr,size,free,extent_size,extent_count,free_count,tags,vg_mda_size,vg_mda_free,lv_count,pv_count,pv_name (cwd None) (commands:153) >> >> >>>>>>> 2019-11-22 05:39:12,415-0500 ERROR (check/loop) [storage.Monitor] Error checking path /rhev/data-center/mnt/192.168.200.4:_exports_nfs_share2/d10879c6-8de1-40ba-87fa-f447844eed2a/dom_md/metadata (monitor:501) >> >> >>>>>>> Traceback (most recent call last): >> >> >>>>>>> File "/usr/lib/python3.6/site-packages/vdsm/storage/monitor.py", line 499, in _pathChecked >> >> >>>>>>> delay = result.delay() >> >> >>>>>>> File "/usr/lib/python3.6/site-packages/vdsm/storage/check.py", line 391, in delay >> >> >>>>>>> raise exception.MiscFileReadException(self.path, self.rc, self.err) >> >> >>>>>>> vdsm.storage.exception.MiscFileReadException: Internal file read failure: ('/rhev/data-center/mnt/192.168.200.4:_exports_nfs_share2/d10879c6-8de1-40ba-87fa-f447844eed2a/dom_md/metadata', 1, 'Read timeout') >> >> >>>>>>> 2019-11-22 05:39:12,416-0500 INFO (check/loop) [storage.Monitor] Domain d10879c6-8de1-40ba-87fa-f447844eed2a became INVALID (monitor:472) >> >> >>>>>>> >> >> >>>>>>> >> >> >>>>>>> I failed to reproduce local to analyze this, I will try again, any hints welcome. >> >> >>>>>>> >> >> >>>>>> >> >> >>>>>> >> >> >>>>>> >> >> >>>>>> https://gerrit.ovirt.org/#/c/104925/1/ shows that 008_basic_ui_sanity.py triggers the problem. >> >> >>>>>> Is there someone with knowledge about the basic_ui_sanity around? >> >> >>>>> >> >> >>>>> How do you think it's related? By commenting out the ui sanity tests and seeing OST with successful finish? >> >> >>>>> >> >> >>>>> Looking at 6134 run you were discussing: >> >> >>>>> >> >> >>>>> - timing of the ui sanity set-up [1]: >> >> >>>>> >> >> >>>>> 11:40:20 @ Run test: 008_basic_ui_sanity.py: >> >> >>>>> >> >> >>>>> - timing of first encountered storage error [2]: >> >> >>>>> >> >> >>>>> 2019-11-22 05:39:12,415-0500 ERROR (check/loop) [storage.Monitor] Error checking path /rhev/data-center/mnt/192.168.200.4:_exports_nfs_share2/d10879c6-8de1-40ba-87fa-f447844eed2a/dom_md/metadata (monitor:501) >> >> >>>>> Traceback (most recent call last): >> >> >>>>> File "/usr/lib/python3.6/site-packages/vdsm/storage/monitor.py", line 499, in _pathChecked >> >> >>>>> delay = result.delay() >> >> >>>>> File "/usr/lib/python3.6/site-packages/vdsm/storage/check.py", line 391, in delay >> >> >>>>> raise exception.MiscFileReadException(self.path, self.rc, self.err) >> >> >>>>> vdsm.storage.exception.MiscFileReadException: Internal file read failure: ('/rhev/data-center/mnt/192.168.200.4:_exports_nfs_share2/d10879c6-8de1-40ba-87fa-f447844eed2a/dom_md/metadata', 1, 'Read timeout') >> >> >>>>> >> >> >>>>> Timezone difference aside, it seems to me that these storage errors occured before doing anything ui-related. >> >> >> >> >> >> >> >> >> >> >> >> You are right, a time.sleep(8*60) in >> >> >> https://gerrit.ovirt.org/#/c/104925/2 >> >> >> has triggers the issue the same way. >> >> >> >> So this is a test issues, assuming that the UI tests can complete in >> >> less than 8 minutes? >> >> >> > >> > To my eyes this looks like storage is just stop working after some time. >> > >> >> >> >> >> >> >> > >> >> > Nir or Steve, can you please confirm that this is a storage problem? >> >> >> >> Why do you think we have a storage problem? >> >> >> > >> > I understand from the posted log snippets that they say that the storage is not accessible anymore, >> >> No, so far one read timeout was reported, this does not mean storage >> is not available anymore. >> It can be temporary issue that does not harm anything. >> >> > while the host is still responsive. >> > This might be triggered by something outside storage, e.g. the network providing the storage stopped working, >> > But I think a possible next step in analysing this issue would be to find the reason why storage is not happy. >> > > Sounds like there was a miscommunication in this thread. > I try to address all of your points, please let me know if something is missing or not clearly expressed. > >> >> First step is to understand which test fails, > > > 098_ovirt_provider_ovn.use_ovn_provider > >> >> and why. This can be done by the owner of the test, > > > The test was added by the network team. > >> >> understanding what the test does > > > The test tries to add a vNIC. > >> >> and what is the expected system behavior. >> > > It is expected that adding a vNIC works, because the VM should be up. What was the actual behavior? >> If the owner of the test thinks that the test failed because of a storage issue > > > I am not sure who is the owner, but I do. Can you explain why how a vNIC failed because of a storage issue?

Can you explain how adding 8 minutes sleep instead of the UI tests reproduced the issue?

>> someone from storage can look at this. >> > > Thanks, I would appreciate this. > >> >> But the fact that adding long sleep reproduce the issue means it is not related >> in any way to storage. >> >> Nir >> >> > >> >> >> >> > >> >> >> >> >> >> >> >> >>>>> >> >> >>>>> I remember talking with Steven Rosenberg on IRC a couple of days ago about some storage metadata issues and he said he got a response from Nir, that "it's a known issue". >> >> >>>>> >> >> >>>>> Nir, Amit, can you comment on this? >> >> >>>> >> >> >>>> >> >> >>>> The error mentioned here is not vdsm error but warning about storage accessibility. We sould convert the tracebacks to warning. >> >> >>>> >> >> >>>> The reason for such issue can be misconfigured network (maybe network team is testing negative flows?), >> >> >>> >> >> >>> >> >> >>> No. >> >> >>> >> >> >>>> >> >> >>>> or some issue in the NFS server. >> >> >>>> >> >> >>> >> >> >>> Only hint I found is >> >> >>> "Exiting Time2Retain handler because session_reinstatement=1" >> >> >>> but I have no idea what this means or if this is relevant at all. >> >> >>> >> >> >>>> >> >> >>>> One read timeout is not an issue. We have a real issue only if we have consistent read timeouts or errors for couple of minutes, after that engine can deactivate the storage domain or some hosts if only these hosts are having trouble to access storage. >> >> >>>> >> >> >>>> In OST we never expect such conditions since we don't test negative flows, and we should have good connectivity with the vms running on the same host. >> >> >>>> >> >> >>> >> >> >>> Ack, this seems to be the problem. >> >> >>> >> >> >>>> >> >> >>>> Nir >> >> >>>> >> >> >>>> >> >> >>>>> [1] https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6134/console >> >> >>>>> [2] https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6134/artifact/exp... >> >> >>>>>> >> >> >>>>>> >> >> >>>>> >> >> >>>>> Marcin, could you please take a look? >> >> >>>>>> >> >> >>>>>> >> >> >>>>>> >> >> >>>>>>>> >> >> >>>>>>>> > >> >> >>>>>>>> > > [3] - https://gerrit.ovirt.org/#/c/104897/ >> >> >>>>>>>> > > >> >> >>>>>>>> > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> >> >>>>>>>> > > > > >> Who installs this rpm in OST? >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > I do not understand the question. >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > > >> >> >>>>>>>> > > > > >> > [...] >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > See [2] for full error. >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > Can someone please take a look? >> >> >>>>>>>> > > > > >> > Thanks >> >> >>>>>>>> > > > > >> > Vojta >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > >> >> >>>>>>>> > > > > >> > [1] https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6128/ >> >> >>>>>>>> > > > > >> > [2] >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> https://jenkins.ovirt.org/job/ovirt-system-tests_manual/6128/artifact >> >> >>>>>>>> > > > > >> / >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > exported-artifacts/test_logs/basic-suite-master/ >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> post-002_bootstrap.py/lago- >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> basic-suite-master-engine/_var_log/ovirt-engine/engine.log___________ >> >> >>>>>>>> > > > > >> ____ >> >> >>>>>>>> > > > > >> ________________________________>> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > Devel mailing list -- devel(a)ovirt.org >> >> >>>>>>>> > > > > >> > To unsubscribe send an email to devel-leave(a)ovirt.org >> >> >>>>>>>> > > > > >> > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > oVirt Code of Conduct: >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> https://www.ovirt.org/community/about/community-guidelines/ >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> > List Archives: >> >> >>>>>>>> > > > > >> >> >> >>>>>>>> > > > > >> https://lists.ovirt.org/archives/list/devel@ovirt.org/message/4K5N3VQ >> >> >>>>>>>> > > > > >> N26B >> >> >>>>>>>> > > > > >> L73K7D45A2IR7R3UMMM23/ >> >> >>>>>>>> > > > > >> _______________________________________________ >> >> >>>>>>>> > > > > >> Devel mailing list -- devel(a)ovirt.org >> >> >>>>>>>> > > > > >> To unsubscribe send an email to devel-leave(a)ovirt.org >> >> >>>>>>>> > > > > >> Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >> >> >>>>>>>> > > > > >> oVirt Code of Conduct: >> >> >>>>>>>> > > > > >> https://www.ovirt.org/community/about/community-guidelines/ >> >> >>>>>>>> > > > > >> List Archives: >> >> >>>>>>>> > > > > >> https://lists.ovirt.org/archives/list/devel@ovirt.org/message/JN7MNUZ >> >> >>>>>>>> > > > > >> N5K3 >> >> >>>>>>>> > > > > >> NS5TGXFCILYES77KI5TZU/ >> >> >>>>>>>> > > > >> >> >>>>>>>> > > > >> >> >>>>>>>> > > >> >> >>>>>>>> > > _______________________________________________ >> >> >>>>>>>> > > Devel mailing list -- devel(a)ovirt.org >> >> >>>>>>>> > > To unsubscribe send an email to devel-leave(a)ovirt.org >> >> >>>>>>>> > > Privacy Statement: https://www.ovirt.org/site/privacy-policy/ >> >> >>>>>>>> > > oVirt Code of Conduct: >> >> >>>>>>>> > > https://www.ovirt.org/community/about/community-guidelines/ List Archives: >> >> >>>>>>>> > > https://lists.ovirt.org/archives/list/devel@ovirt.org/message/UPJ5SEAV5Z65H >> >> >>>>>>>> > > 5BQ3SCHOYZX6JMTQPBW/ >> >> >>>>>>>> > >> >> >>>>>>>> >> >> >>>>> >> >> >>>>> >> >> >>>>> -- >> >> >>>>> Martin Perina >> >> >>>>> Manager, Software Engineering >> >> >>>>> Red Hat Czech s.r.o. >> >> >>>>> >> >> >>>>> >> >> >>