4:06 a.m.
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Le 24/04/2016 19:49, Paul Groeneweg | Pazion a =E9crit :
I have followed the setup on=20
http://www.ovirt.org/documentation/admin-guide/serial-console-setup/
I am able to ssh to the hosted engine and select a VM.
A VM with console enabled and permissions set gives a blank screen (=20
freezes ).
Many reasons can lead to this, depending on the guest os.
Have you modified all needed files into the guest OS?
This is what I did for my vms (tty0 is to get the boot sequence into=20
the spice/vnc console insted of a black screen)
CentOS 5:
* grub.conf
for i in $(cat /tmp/update_grub); do ssh root@$i 'sed -e=20
"s/^\\t\(kernel\).*$/&*console\=3Dtty0 console\=3DttyS0*/g" -i=20
/etc/grub.conf'; done
* inittab
for i in $(cat /tmp/liste) ; do echo $i; ssh root@$i "sed -i \"/tty6/a=20
*S0:2345:respawn:/sbin/mingetty ttyS0*\" /etc/inittab"; done
* securetty
for i in $(cat /tmp/liste) ; do echo $i; ssh root@$i "sed -i \"/tty11/a=20
*ttyS0*\" /etc/securetty"; done
CentOS 6:
* grub.conf
for i in $(cat /tmp/update_grub); do ssh root@$i 'sed -e=20
"s/^\\t\(kernel\).*$/&*console\=3Dtty0 console\=3DttyS0*/g" -i=20
/etc/grub.conf'; done
* securetty
for i in $(cat /tmp/liste) ; do echo $i; ssh root@$i "sed -i \"/tty11/a=20
*ttyS0*\" /etc/securetty"; done
CentOS 7 : securetty file already includes ttyS0 by default
* grub2.cfg
for i in $(cat /tmp/update_grub2);do echo -e "$i:\n"; ssh root@$i 'sed=20
-e "s/^\\t\(linux16\).*$/&*console\=3Dtty0 console\=3DttyS0*/g" -i=20
/boot/grub2/grub.cfg'; done
for i in $(cat /tmp/update_grub2);do echo -e "$i:\n"; ssh root@$i=20
'grub2-mkconfig -o /boot/grub2/grub.cfg'; done
As a last alternative, grubby does the staff on every OS and grub=20
versions, but doesn't modify the securetty file.
* grubby
for i in $(cat /tmp/update_grub2);do echo -e "$i:\n"; ssh root@$i=20
"grubby --update-kernel=3DALL --args=3D\"console=3Dtty0 console=3DttyS0\"=
"; done
So I checked serial-getty@.service
So you run el7 :)
Am I right this service should run on a host?
Sure, but not
enough
When I check status, I get this:
... systemd[1]: *Dependency failed for Serial Getty on hvc0.*
.. systemd[1]: *Job serial-getty(a)hvc0.service/start failed with result=20
'dependency'.*
*
*
What needs to be done? When I restart the service it takes a long tine=20
and looks like a timeout is triggered.
you can check if ttyS0 is opened with stty < /dev/ttyS0
If true, the issue might come from a right permission.
Did you add the wanted user (doesn't work with group) per vm with the=20
minimum UserVmManager role?
if the user is SuperUser, it still can't connect to the console due to a=20
bug.
Looking forward to use the serial console feature.
it works very well and it is very convinient:)
Just a last tip : the default escape character to escape from ssh is "~."
Good luck!
*
*
_______________________________________________
Users mailing list
Users(a)ovirt.org
http://lists.ovirt.org/mailman/listinfo/users
--=20
Nathana=EBl Blanchet
Supervision r=E9seau
P=F4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 =09
T=E9l. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
blanchet(a)abes.fr
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Le 24/04/2016 19:49, Paul Groeneweg | Pazion a =E9crit=A0:<br>
<blockquote
cite=3D"mid:CAE1B0QJsn8hxA5C5vkZci-UTCMcMtvWcZG29zjegnttGoSeyLg@mail.gmai=
l.com"
type=3D"cite">
<div dir=3D"ltr">I have followed the setup on=A0<a
moz-do-not-send=3D"true"
href=3D"http://www.ovirt.org/documentation/admin-guide/serial-consol...
up/"><a class=3D"moz-txt-link-freetext"
href=3D"http://www.ovirt.org/docu=
mentation/admin-guide/serial-console-setup/">http://www.ovirt.org...
tation/admin-guide/serial-console-setup/</a></a>
<div><br>
</div>
<div>I am able to ssh to the hosted engine and select a VM.</div>
<div>A VM with console enabled and permissions set gives a blank
screen ( freezes ).</div>
</div>
</blockquote>
Many reasons can lead to this, depending on the guest os. <br>
Have you modified all needed files into the guest OS?<br>
<br>
=A0This is what I did for my vms (tty0 is to get the boot sequence
into the spice/vnc console insted of a black screen) <br>
<br>
CentOS 5:<br>
<ul>
<li>grub.conf<br>
</li>
</ul>
for i in $(cat /tmp/update_grub); do ssh root@$i 'sed -e
"s/^\\t\(kernel\).*$/&<b> console\=3Dtty0
console\=3DttyS0</b>/g"=
-i
/etc/grub.conf'; done<br>
<ul>
<li>inittab<br>
</li>
</ul>
for i in $(cat /tmp/liste) ; do echo $i; ssh root@$i "sed -i
\"/tty6/a <b>S0:2345:respawn:/sbin/mingetty ttyS0</b>\"
/etc/inittab"; done<br>
<ul>
<li>securetty<br>
</li>
</ul>
for i in $(cat /tmp/liste) ; do echo $i; ssh root@$i "sed -i
\"/tty11/a <b>ttyS0</b>\" /etc/securetty"; done<br>
<br>
CentOS 6:<br>
<ul>
<li>grub.conf<br>
</li>
</ul>
for i in $(cat /tmp/update_grub); do ssh root@$i 'sed -e
"s/^\\t\(kernel\).*$/&<b> console\=3Dtty0
console\=3DttyS0</b>/g"=
-i
/etc/grub.conf'; done<br>
<ul>
<li>securetty<br>
</li>
</ul>
for i in $(cat /tmp/liste) ; do echo $i; ssh root@$i "sed -i
\"/tty11/a <b>ttyS0</b>\" /etc/securetty"; done<br>
<br>
CentOS 7 : securetty file already includes ttyS0 by default<br>
<ul>
<li>grub2.cfg<br>
</li>
</ul>
for i in $(cat /tmp/update_grub2);do echo -e "$i:\n"; ssh root@$i
'sed -e "s/^\\t\(linux16\).*$/&<b> console\=3Dtty0
console\=3Dtty=
S0</b>/g"
-i /boot/grub2/grub.cfg'; done<br>
for i in $(cat /tmp/update_grub2);do echo -e "$i:\n"; ssh root@$i
'grub2-mkconfig -o /boot/grub2/grub.cfg'; done<br>
<br>
As a last alternative, grubby does the staff on every OS and grub
versions, but doesn't modify the securetty file.<br>
<ul>
<li>grubby <br>
</li>
</ul>
for i in $(cat /tmp/update_grub2);do echo -e "$i:\n"; ssh root@$i
"grubby --update-kernel=3DALL --args=3D\"console=3Dtty0 console=3Dtty=
S0\"";
done<br>
<blockquote
cite=3D"mid:CAE1B0QJsn8hxA5C5vkZci-UTCMcMtvWcZG29zjegnttGoSeyLg@mail.gmai=
l.com"
type=3D"cite">
<div dir=3D"ltr">
<div><br>
</div>
<div>So I checked=A0<span style=3D"line-height:1.5"><a
class=3D"m=
oz-txt-link-abbreviated"
href=3D"mailto:serial-getty@.service">serial-get=
ty@.service</a></span></div>
</div>
</blockquote>
So you run el7 :)<br>
<blockquote
cite=3D"mid:CAE1B0QJsn8hxA5C5vkZci-UTCMcMtvWcZG29zjegnttGoSeyLg@mail.gmai=
l.com"
type=3D"cite">
<div dir=3D"ltr">
<div>Am I right this service should run on a host?</div>
</div>
</blockquote>
Sure, but not enough<br>
<blockquote
cite=3D"mid:CAE1B0QJsn8hxA5C5vkZci-UTCMcMtvWcZG29zjegnttGoSeyLg@mail.gmai=
l.com"
type=3D"cite">
<div dir=3D"ltr">
<div><br>
</div>
<div>When I check status, I get this:<br>
<div><br>
</div>
<div>
<p class=3D"p1"><span class=3D"s1">...
systemd[1]: </span><sp=
an
class=3D"s2"><b>Dependency failed for Serial Getty on
hvc0.</b></span></p>
<p class=3D"p1"><span class=3D"s1">..
systemd[1]: <b>Job
<a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:se=
rial-getty@hvc0.service/start">serial-getty(a)hvc0.service/start</a> failed=
with result
'dependency'.</b></span></p>
<p class=3D"p1"><span
class=3D"s1"><b><br>
</b></span></p>
<p class=3D"p1"><span class=3D"s1">What needs
to be done? Whe=
n I
restart the service it takes a long tine and looks like
a timeout is triggered.</span></p>
</div>
</div>
</div>
</blockquote>
you can check if ttyS0 is opened with=A0 stty < /dev/ttyS0<br>
If true, the issue might come from a right permission. <br>
Did you add the wanted user (doesn't work with group) per vm with
the minimum UserVmManager role? <br>
if the user is SuperUser, it still can't connect to the console due
to a bug.<br>
<blockquote
cite=3D"mid:CAE1B0QJsn8hxA5C5vkZci-UTCMcMtvWcZG29zjegnttGoSeyLg@mail.gmai=
l.com"
type=3D"cite">
<div dir=3D"ltr">
<div>
<div>
<p class=3D"p1"><span class=3D"s1">Looking
forward to use the
serial console feature.</span></p>
</div>
</div>
</div>
</blockquote>
it works very well and it is very convinient:) <br>
<br>
Just a last tip : the default escape character to escape from ssh is
"~."<br>
<br>
Good luck!<br>
<blockquote
cite=3D"mid:CAE1B0QJsn8hxA5C5vkZci-UTCMcMtvWcZG29zjegnttGoSeyLg@mail.gmai=
l.com"
type=3D"cite">
<div dir=3D"ltr">
<div>
<div>
<p class=3D"p1"><span
class=3D"s1"><b><br>
</b></span></p>
</div>
</div>
</div>
<br>
<fieldset class=3D"mimeAttachmentHeader"></fieldset>
<br>
<pre wrap=3D"">_______________________________________________
Users mailing list
<a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:Users@ovirt.org">Use=
rs(a)ovirt.org</a>
<a class=3D"moz-txt-link-freetext"
href=3D"http://lists.ovirt.org/mailman=
/listinfo/users">http://lists.ovirt.org/mailman/listinfo/users</a>
</pre>
</blockquote>
<br>
<pre class=3D"moz-signature" cols=3D"72">--=20
Nathana=EBl Blanchet
Supervision r=E9seau
P=F4le Infrastrutures Informatiques
227 avenue Professeur-Jean-Louis-Viala
34193 MONTPELLIER CEDEX 5 =09
T=E9l. 33 (0)4 67 54 84 55
Fax 33 (0)4 67 54 84 14
<a class=3D"moz-txt-link-abbreviated"
href=3D"mailto:blanchet@abes.fr">bl=
anchet(a)abes.fr</a> </pre>
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