[ovs-dev] [PATCH ovn 4/4] rhel: Run ovn services with the 'openvswitch' user

Jaime Caamaño Ruiz jcaamano at suse.de
Tue Aug 20 12:31:23 UTC 2019


> This is patch 4 of the series. Patch 1 takes care of adding ovn
> specific run dirs (run, log, db dirs).
> Can you please take a look at the series ?

Sorry, I completely missed those. You can disregard much of what I
said.

> Is there a way to solve this issue ? If we run ovn services as
> "ovn:openvswitch" (or ovn:hugetlbs in the case
> of dpdk), can ovn-controller access  /var/run/openvswitch/db.sock ?

You need write permission on db.sock. OVS currently creates it with
0700 that allows only the user owner to write to it, while it's most
common to create socket files with 0660 that would give group write
permissions. (files lib/socket-util-unix.c and
python/ovs/socket_util.py). I don't know the original reason for the
stricter permissions on these, some else could clarify.

Then you would probably want ovn user in openvswitch group.

In regards to hugepages, I would probably stop using the system wide
/dev/hugepages and instead setup a separate mount using hugeadm
properly owned by the openvswitch user. Then we don't need a separate
group setup for that and we don't interfere with the system.

BR
Jaime.


-----Original Message-----
From: Numan Siddique <nusiddiq at redhat.com>
To: Jaime Caamano <JCaamano at suse.com>
Cc: ovs dev <dev at openvswitch.org>
Subject: Re: [PATCH ovn 4/4] rhel: Run ovn services with the
'openvswitch' user
Date: Wed, 14 Aug 2019 18:44:28 +0530



On Wed, Aug 14, 2019 at 6:08 PM Jaime Caamaño Ruiz <jcaamano at suse.de>
wrote:
> Hello
> 
> Some comments, that probably are due to me being confused checking
> the
> new repo:
> 


Hi Jaime,

This is patch 4 of the series. Patch 1 takes care of adding ovn
specific run dirs (run, log, db dirs).
Can you please take a look at the series ?

Patch 0 - https://mail.openvswitch.org/pipermail/ovs-dev/2019-August/36
1628.html
https://patchwork.ozlabs.org/project/openvswitch/list/?submitter=67480


 
> 1)
> 
> > sed -i 's:\(.*su\).*:\1 ovn ovn:' %{_sysconfdir}/logrotate.d/ovn
> 
> I dont see the file %{_sysconfdir}/logrotate.d/ovn included anywhere.
> Anyway, since OVN_USER_ID defaults to openvswitch:openvswitch,
> shouldn't this be


It's added in patch 3 of the series - https://patchwork.ozlabs.org/patc
h/1146492/

 
> sed -i 's:\(.*su\).*:\1 openvswitch openvswitch:'
> %{_sysconfdir}/logrotate.d/ovn
> 
> What about when the group is hugetlbfs?
> 

hugetlbfs is used when ovs  is configured with dpdk. 

ovs-vswitchd/ovsdb-server will be running as user:group -
"openvswitch:hugetlbfs".

If ovn-controller runs as user:group - "openvswitch:openvswitch" it can
still access
the file - /var/run/openvswitch/db.sock and other br-*.mgmt socket
files right ?

That's what I thought. Please correct me If I am wrong.
 
> 2)
> 
> #OVN_USER_ID="openvswitch:openvswitch"
> 
> Again, what about when the group should be hugetlbfs?
> 
> 2)
> 
> > chown -R $INSTALL_USER:$INSTALL_GROUP $ovn_dbdir
> > chown -R $INSTALL_USER:$INSTALL_GROUP $OVN_RUNDIR
> > chown -R $INSTALL_USER:$INSTALL_GROUP $ovn_logdir
> 
> Since OVN and OVS still share log and run directories (right?, anyway
> I
> dont see where ovn_dbdir and ovn_logdir are set), changing
> OVN_USER_ID
> to a different value than OVS_USER_ID without changing a bunch of
> other
> stuff will break things. Doesn't it make sense to use OVS_USER_ID
> instead of introducing OVN_USER_ID until there is a more meaningful
> split?
> 

Please see patch 1 of the series which sets ovn_logdir, ovn_dbdir etc.

The idea is to totally separate out OVN from OVS including user ids.
But since its a bit tricky
as ovn-controller needs to access /var/run/openvswitch/db.sock, I
thought of using openvswitch user
for now. But added the OVN_USER_ID so that it would be easier later to
switch to new 'ovn' user.

Is there a way to solve this issue ? If we run ovn services as
"ovn:openvswitch" (or ovn:hugetlbs in the case
of dpdk), can ovn-controller access  /var/run/openvswitch/db.sock ?
I tested it by running as "ovn:openvswitch" and it was not working for
me. May be I am doing something wrong ?

Thanks for the comments.

Numan

 
> BR
> Jaime.
> 
> -----Original Message-----
> From: nusiddiq at redhat.com
> To: dev at openvswitch.org
> Cc: Jaime Caamano <JCaamano at suse.com>
> Subject: [PATCH ovn 4/4] rhel: Run ovn services with the
> 'openvswitch'
> user
> Date: Tue, 13 Aug 2019 21:58:22 +0530
> 
> From: Numan Siddique <nusiddiq at redhat.com>
> 
> This patch could have created a new user 'ovn' for ovn services
> instead
> of using 'openvswitch' user. But this would require some amount of
> work
> and
> proper testing since the new user 'ovn' should be part of
> 'openvswitch'
> group (to access /var/run/openvswitch/db.sock.). If ovs is compiled
> with dpdk,
> then it may get tricky (as ovs-vswitchd is run as user -
> openvswitch:hugetlbfs).
> We can support a new user for 'ovn' services in the future.
> 
> Recently the commit [1] in ovs repo added support to run ovn services
> with the
> 'openvswitch' user, but this commit was not applied to ovn repo as we
> had
> already created a new OVN repo. During the OVS/OVN formal split, we
> missed
> out on applying the patch [1]. This patch takes some code from [1].
> 
> [1] - 94e1e8be3187 ("rhel: run ovn with the same user as ovs").
> 
> CC: Jaime Caamaño Ruiz <jcaamano at suse.com>
> Signed-off-by: Numan Siddique <nusiddiq at redhat.com>
> ---
>  rhel/automake.mk                                    |  3 ++-
>  rhel/ovn-fedora.spec.in                             | 13
> +++++++++++++
>  ...r_lib_systemd_system_ovn-controller-vtep.service |  2 ++
>  rhel/usr_lib_systemd_system_ovn-controller.service  |  2 ++
>  rhel/usr_lib_systemd_system_ovn-northd.service      |  5 ++++-
>  ...usr_share_ovn_scripts_systemd_sysconfig.template | 13
> +++++++++++++
>  utilities/ovn-ctl                                   | 12
> ++++++++++++
>  7 files changed, 48 insertions(+), 2 deletions(-)
>  create mode 100644
> rhel/usr_share_ovn_scripts_systemd_sysconfig.template
> 
> diff --git a/rhel/automake.mk b/rhel/automake.mk
> index 39e216b01..a46e6579b 100644
> --- a/rhel/automake.mk
> +++ b/rhel/automake.mk
> @@ -15,7 +15,8 @@ EXTRA_DIST += \
>         rhel/usr_lib_systemd_system_ovn-controller-vtep.service \
>         rhel/usr_lib_systemd_system_ovn-northd.service \
>         rhel/usr_lib_firewalld_services_ovn-central-firewall-
> service.xml \
> -       rhel/usr_lib_firewalld_services_ovn-host-firewall-service.xml
> +       rhel/usr_lib_firewalld_services_ovn-host-firewall-service.xml
> \
> +       rhel/usr_share_ovn_scripts_systemd_sysconfig.template
> 
>  update_rhel_spec = \
>    $(AM_V_GEN)($(ro_shell) && sed -e 's,[@]VERSION[@],$(VERSION),g')
> \
> diff --git a/rhel/ovn-fedora.spec.in b/rhel/ovn-fedora.spec.in
> index cbca87511..14035de9a 100644
> --- a/rhel/ovn-fedora.spec.in
> +++ b/rhel/ovn-fedora.spec.in
> @@ -186,6 +186,10 @@ make %{?_smp_mflags}
>  rm -rf $RPM_BUILD_ROOT
>  make install DESTDIR=$RPM_BUILD_ROOT
> 
> +install -p -D -m 0644 \
> +        rhel/usr_share_ovn_scripts_systemd_sysconfig.template \
> +        $RPM_BUILD_ROOT/%{_sysconfdir}/sysconfig/ovn
> +
>  for service in ovn-controller ovn-controller-vtep ovn-northd; do
>          install -p -D -m 0644 \
>                        
>  rhel/usr_lib_systemd_system_${service}.service
> \
> @@ -319,6 +323,14 @@ fi
>      fi
>  %endif
> 
> +%post
> +%if %{with libcapng}
> +if [ $1 -eq 1 ]; then
> +    sed -i 's:^#OVN_USER_ID=:OVN_USER_ID=:'
> %{_sysconfdir}/sysconfig/ovn
> +    sed -i 's:\(.*su\).*:\1 ovn ovn:' %{_sysconfdir}/logrotate.d/ovn
> +fi
> +%endif
> +
>  %post central
>  %if 0%{?systemd_post:1}
>      %systemd_post ovn-northd.service
> @@ -413,6 +425,7 @@ if [ $1 -eq 1 ]; then
>  fi
> 
>  %files
> +%config(noreplace) %{_sysconfdir}/sysconfig/ovn
>  %{_bindir}/ovn-nbctl
>  %{_bindir}/ovn-sbctl
>  %{_bindir}/ovn-trace
> diff --git a/rhel/usr_lib_systemd_system_ovn-controller-vtep.service
> b/rhel/usr_lib_systemd_system_ovn-controller-vtep.service
> index 832849488..09ad0612c 100644
> --- a/rhel/usr_lib_systemd_system_ovn-controller-vtep.service
> +++ b/rhel/usr_lib_systemd_system_ovn-controller-vtep.service
> @@ -38,10 +38,12 @@ Restart=on-failure
>  Environment=OVS_RUNDIR=%t/openvswitch
>  Environment=OVN_RUNDIR=%t/ovn
>  Environment=OVN_DB=unix:%t/ovn/ovnsb_db.sock
> +EnvironmentFile=-/etc/sysconfig/ovn
>  Environment=VTEP_DB=unix:%t/openvswitch/db.sock
>  EnvironmentFile=-/etc/sysconfig/ovn-controller-vtep
>  ExecStart=/usr/bin/ovn-controller-vtep -vconsole:emer -vsyslog:err
> -vfile:info \
>            --log-file=/var/log/ovn/ovn-controller-vtep.log \
> +          --ovn-user=${OVN_USER_ID} \
>            --no-chdir --pidfile=${OVN_RUNDIR}/ovn-controller-vtep.pid 
> \
>            --ovnsb-db=${OVN_DB} --vtep-db=${VTEP_DB}
> 
> diff --git a/rhel/usr_lib_systemd_system_ovn-controller.service
> b/rhel/usr_lib_systemd_system_ovn-controller.service
> index 6c8f33a27..15d0ac853 100644
> --- a/rhel/usr_lib_systemd_system_ovn-controller.service
> +++ b/rhel/usr_lib_systemd_system_ovn-controller.service
> @@ -24,8 +24,10 @@ Type=forking
>  PIDFile=/var/run/ovn/ovn-controller.pid
>  Restart=on-failure
>  Environment=OVN_RUNDIR=%t/ovn OVS_RUNDIR=%t/openvswitch
> +EnvironmentFile=-/etc/sysconfig/ovn
>  EnvironmentFile=-/etc/sysconfig/ovn-controller
>  ExecStart=/usr/share/ovn/scripts/ovn-ctl --no-monitor \
> +           --ovn-user=${OVN_USER_ID} \
>            start_controller $OVN_CONTROLLER_OPTS
>  ExecStop=/usr/share/ovn/scripts/ovn-ctl stop_controller
> 
> diff --git a/rhel/usr_lib_systemd_system_ovn-northd.service
> b/rhel/usr_lib_systemd_system_ovn-northd.service
> index 82c23cee4..d281f861c 100644
> --- a/rhel/usr_lib_systemd_system_ovn-northd.service
> +++ b/rhel/usr_lib_systemd_system_ovn-northd.service
> @@ -21,8 +21,11 @@ After=syslog.target
>  Type=oneshot
>  RemainAfterExit=yes
>  Environment=OVN_RUNDIR=%t/ovn OVN_DBDIR=/var/lib/ovn
> +EnvironmentFile=-/etc/sysconfig/ovn
>  EnvironmentFile=-/etc/sysconfig/ovn-northd
> -ExecStart=/usr/share/ovn/scripts/ovn-ctl start_northd
> $OVN_NORTHD_OPTS
> +ExecStartPre=-/usr/bin/chown -R ${OVN_USER_ID} ${OVN_DBDIR}
> +ExecStart=/usr/share/ovn/scripts/ovn-ctl \
> +          --ovn-user=${OVN_USER_ID} start_northd $OVN_NORTHD_OPTS
>  ExecStop=/usr/share/ovn/scripts/ovn-ctl stop_northd
> 
>  [Install]
> diff --git a/rhel/usr_share_ovn_scripts_systemd_sysconfig.template
> b/rhel/usr_share_ovn_scripts_systemd_sysconfig.template
> new file mode 100644
> index 000000000..4543d1bc9
> --- /dev/null
> +++ b/rhel/usr_share_ovn_scripts_systemd_sysconfig.template
> @@ -0,0 +1,13 @@
> +### Configuration options for OVN
> +#
> +# Set "nice" priority at which to run ovn-northd:
> +# --ovn-northd-priority=-10
> +#
> +# Set "nice" priority at which to run ovn-controller:
> +# --ovn-controller-priority=-10
> +#
> +#
> +OPTIONS=""
> +
> +# Uncomment and set the OVN User/Group value
> +#OVN_USER_ID="openvswitch:openvswitch"
> diff --git a/utilities/ovn-ctl b/utilities/ovn-ctl
> index 39e03b189..f4ed8f5a8 100755
> --- a/utilities/ovn-ctl
> +++ b/utilities/ovn-ctl
> @@ -183,6 +183,18 @@ $cluster_remote_port
>          upgrade_db "$file" "$schema"
>      fi
> 
> +    # Set the owner of the ovn_dbdir (with -R option) to OVN_USER if
> set.
> +    # This is required because the ovndbs are created with root
> permission
> +    # if not present when create_cluster/upgrade_db is called.
> +    INSTALL_USER="root"
> +    INSTALL_GROUP="root"
> +    [ "$OVN_USER" != "" ] && INSTALL_USER="${OVN_USER%:*}"
> +    [ "${OVN_USER##*:}" != "" ] && INSTALL_GROUP="${OVN_USER##*:}"
> +
> +    chown -R $INSTALL_USER:$INSTALL_GROUP $ovn_dbdir
> +    chown -R $INSTALL_USER:$INSTALL_GROUP $OVN_RUNDIR
> +    chown -R $INSTALL_USER:$INSTALL_GROUP $ovn_logdir
> +
>      set ovsdb-server
>      set "$@" $log --log-file=$logfile
>      set "$@" --remote=punix:$sock --pidfile=$db_pid_file


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