- Devel - oVirt List Archives

[Engine-devel] VDSM tasks, the future
by Saggi Mizrahi 16 Dec '12

16 Dec '12

Because I started hinting about how VDSM tasks are going to look going forward I thought it's better I'll just write everything in an email so we can talk about it in context. This is not set in stone and I'm still debating things myself but it's very close to being done. - Everything is asynchronous. The nature of message based communication is that you can't have synchronous operations. This is not really debatable because it's just how TCP\AMQP\<messaging> works. - Task IDs will be decided by the caller. This is how json-rpc works and also makes sense because no the engine can track the task without needing to have a stage where we give it the task ID back. IDs are reusable as long as no one else is using them at the time so they can be used for synchronizing operations between clients (making sure a command is only executed once on a specific host without locking). - Tasks are transient If VDSM restarts it forgets all the task information. There are 2 ways to have persistent tasks: 1. The task creates an object that you can continue work on in VDSM. The new storage does that by the fact that copyImage() returns one the target volume has been created but before the data has been fully copied. From that moment on the stat of the copy can be queried from any host using getImageStatus() and the specific copy operation can be queried with getTaskStatus() on the host performing it. After VDSM crashes, depending on policy, either VDSM will create a new task to continue the copy or someone else will send a command to continue the operation and that will be a new task. 2. VDSM tasks just start other operations track-able not through the task interface. For example Gluster. gluster.startVolumeRebalance() will return once it has been registered with Gluster. glster.getOperationStatuses() will return the state of the operation from any host. Each call is a task in itself. - No task tags. They are silly and the caller can mangle whatever in the task ID if he really wants to tag tasks. - No explicit recovery stage. VDSM will be crash-only, there should be efforts to make everything crash-safe. If that is problematic, in case of networking, VDSM will recover on start without having a task for it. - No clean Task: Tasks can be started by any number of hosts this means that there is no way to own all tasks. There could be cases where VDSM starts tasks on it's own and thus they have no owner at all. The caller needs to continually track the state of VDSM. We will have brodcasted events to mitigate polling. - No revert Impossible to implement safely. - No SPM\HSM tasks SPM\SDM is no longer necessary for all domain types (only for type). What used to be SPM tasks, or tasks that persist and can be restarted on other hosts is talked about in previous bullet points.

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[Engine-devel] Creating New Data-Center and Permission on Network
by Moti Asayag 16 Dec '12

16 Dec '12

Hi, When creating a new data-center, a management network is created for it. By default the created management network is defined as VM network. I'd like to consult from permissions perspective, what is the preferred permission settings for that network. The network is defined as management network, therefore it is designed be used by VMs. However, the admin should grant permissions on that networks to the target users (which one might find tedious). We can grant permission on that network to 'everyone' with role 'NetworkUser', but in case the admin doesn't meant this network to be used, the permission should be removed. In 'Add Logical Network' dialog I've added a new checkbox to allow granting 'everyone' a role for using that network ('NetworkUser'). We can embrace same method in 'Add Data-Center' dialog. Thoughts ? Thanks, Moti

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[Engine-devel] ThreadPoolUtil with 500 threads and no queue?
by Juan Hernandez 16 Dec '12

16 Dec '12

Hello all, What is the reasoning behind the decision to have a pool with a maximum of 500 threads and no job queue (see ThreadPoolUtil.java)? Wouldn't it make more sense to have a much smaller thread pool and a potentially large queue of jobs? Regards, Juan Hernandez -- Dirección Comercial: C/Jose Bardasano Baos, 9, Edif. Gorbea 3, planta 3ºD, 28016 Madrid, Spain Inscrita en el Reg. Mercantil de Madrid – C.I.F. B82657941 - Red Hat S.L.

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[Engine-devel] Design review summary for 3.2 - adding support for External Events
by Eli Mesika 16 Dec '12

16 Dec '12

Discussion : http://wiki.ovirt.org/wiki/Talk:ExternalEvents Updated Design : http://wiki.ovirt.org/wiki/Features/Design/DetailedExternalEvents#Future_di…

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[Engine-devel] UI plugins - next steps
by Vojtech Szocs 13 Dec '12

13 Dec '12

Hi guys, here's my list of tasks that didn't make it into UI plugins yet. These tasks should be revisited and implemented in future patches. The list isn't sorted in any way, so feel free to comment or highlight specific tasks to raise their priority, or add your own tasks/ideas. 1. Pass proper (restapi-definition) entities to UI plugins, instead of simple "{entityId:<guidAsString>}" objects - using restapi-types mappers to map backend business entities to restapi-definition entities (Java POJOs generated from api.xsd via JAXB) - exporting restapi-definition entities for use with JavaScript (UI plugins), e.g. using gwt-exporter [1] (alternatively, we could use GWT deferred binding and do this ourselves) 2. showDialog API function should integrate with WebAdmin dialog infrastructure - shouldn't be too hard, need to create custom dialog PresenterWidget/View and bind it as non-singleton (just like other popups in oVirt GUI) 3. Extend existing WebAdmin dialogs - prototype Doron's proposal to extend Edit Cluster Policy dialog with custom options that would be passed to backend 4. Introduce form-based tabs - custom tab that would display key/value pairs organized in columns, just like in standard "General" sub tabs 5. Introduce table-based tabs - custom tab that would display grid (table) just like in standard main tabs, with API to add columns, set data, etc. 6. Improve api.addMainTabActionButton to allow different button vs. context menu item representations (only button, only menu item, both) 7. Add api.currentUserName and api.currentUserId API functions (these would return same data as with UserLogin event parameters) 8. Minor things: consider renaming UiInit to PluginInit (one-time plugin initialization, called only once, can do non-UI init stuff there as well), consider renaming api.ready to api.initialize (plugin indicates that infrastructure can proceed with initializing itself) Regards, Vojtech [1] http://code.google.com/p/gwt-exporter/wiki/GettingStarted

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[Engine-devel] Adding Authentication mechanism to oVirt
by Alon Bar-Lev 13 Dec '12

13 Dec '12

------=_Part_4736650_2080278089.1355331209999 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hello Thierry, If I understand correctly you wish to help in modifying the engine to support non GSSAPI authentication methods. Following is a quick design goals for this implementation. I will be glad to improve this. Alon --- Implementation should support the following transports: 1. LDAP (plain). 2. LDAP over TLS. 3. LDAP with StartTLS. Implementation should support the following authentication methods: 1. Simple. 2. Digest-MD5 (plain and strong). I believe the GSSAPI can be dropped, I see no advantage of using it. A sample of low level implementation for transport and authentication is attached. When adding a domain the following facts should be provided: 1. Search user name. 2. Search user password. 3. Transport type (ldap, ldaps, ldap+startTLS) 4. Authentication (simple, Digest-MD5) 5. Sever selection policy (failover, round-robin, random). 6. Server address type (explicit, DNS record) 7. Server address set. 8. Optional base DN. 9. Optional root certificate. 10. Optional certificate chain. 11. Search page size. 10. Query timeout. etc... Within product there are two separate components that perform LDAP authentication: 1. User password validation. 2. User permission fetch. These two components needs to work in share-nothing mode, meaning that each should communicate with directory independently with the other. USER PASSWORD VALIDATION Input: user Input: domain Input: password Output: DN of user Output: success/failure Credentials used: user/password provided. Notes: LDAP session should not be cached. Logic: Perform LDAP bind. USER PERMISSION FETCH Input: DN of user (passed by user password validation) Input: domain (passed by user password validation) Output: A set of permissions Credentials used: search user and password configured within system. Notes: LDAP context can be cached. Logic: Perform LDAP searches, this is most of current logic. ------=_Part_4736650_2080278089.1355331209999 Content-Type: text/x-java; name=LDAPSearch.java Content-Disposition: attachment; filename=LDAPSearch.java Content-Transfer-Encoding: base64 Lyo9PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09PT09 PT09PT09PT09PT09PQoKTGljZW5zZWQgdG8gdGhlIEFwYWNoZSBTb2Z0d2FyZSBGb3VuZGF0aW9u IChBU0YpIHVuZGVyIG9uZSBvciBtb3JlCmNvbnRyaWJ1dG9yIGxpY2Vuc2UgYWdyZWVtZW50cy4g IFNlZSB0aGUgTk9USUNFIGZpbGUgZGlzdHJpYnV0ZWQgd2l0aAp0aGlzIHdvcmsgZm9yIGFkZGl0 aW9uYWwgaW5mb3JtYXRpb24gcmVnYXJkaW5nIGNvcHlyaWdodCBvd25lcnNoaXAuClRoZSBBU0Yg bGljZW5zZXMgdGhpcyBmaWxlIHRvIFlvdSB1bmRlciB0aGUgQXBhY2hlIExpY2Vuc2UsIFZlcnNp b24gMi4wCih0aGUgIkxpY2Vuc2UiKTsgeW91IG1heSBub3QgdXNlIHRoaXMgZmlsZSBleGNlcHQg aW4gY29tcGxpYW5jZSB3aXRoCnRoZSBMaWNlbnNlLiAgWW91IG1heSBvYnRhaW4gYSBjb3B5IG9m IHRoZSBMaWNlbnNlIGF0CgogICAgaHR0cDovL3d3dy5hcGFjaGUub3JnL2xpY2Vuc2VzL0xJQ0VO 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4 8

[Engine-devel] patches waiting for review
by Laszlo Hornyak 13 Dec '12

13 Dec '12

Hi, I have abandoned my patches that did not get +2 in a month, so now I have a reduced list of patches waiting for +2: http://gerrit.ovirt.org/#/dashboard/1000027 Your feedback is welcome! Thx, Laszlo

1 0

Re: [Engine-devel] Request power-user status for mom project in jenkins
by Eyal Edri 12 Dec '12

12 Dec '12

[adding engine-devel] usually there is an official vote on each new power user for jenkins, and as long as there are no objections it is approved. since i know you're a mom maintainer and familiar with jenkins, i vote +1. Eyal. ----- Original Message ----- > From: "Adam Litke" <agl(a)us.ibm.com> > To: infra(a)ovirt.org > Cc: eedri(a)redhat.com > Sent: Tuesday, December 11, 2012 6:11:45 PM > Subject: Request power-user status for mom project in jenkins > > Hi all, > > I am the maintainer of the mom sub-project. Recently we upgraded the > mom build > process to use autotools. Unfortunately this has broken the Jenkins > build for > the project. Rather than asking here whenever I need an update to > the build > job, I think it makes sense for me to administer that myself. If > there is > agreement about this, could someone help me to acquire the relavent > permissions? > > Thanks! > > -- > Adam Litke <agl(a)us.ibm.com> > IBM Linux Technology Center > >

3 2

[Engine-devel] UI plugins patches merged, moving out of proof-of-concept stage
by Vojtech Szocs 12 Dec '12

12 Dec '12

Hi everyone, I'm happy to announce that oVirt UI plugins feature just moved out of proof-of-concept stage, with relevant patches [1,2] merged into ovirt-engine git repository. I'll be working on related documentation (wiki) in near future, along with contributing some sample plugins into samples-uiplugins [3] git repository. I'd like to thank everyone involved in pushing this feature forward. I hope we'll see some interesting plugins soon! Regards, Vojtech [1] http://gerrit.ovirt.org/#/c/8120/ [2] http://gerrit.ovirt.org/#/c/9250/ [3] git://gerrit.ovirt.org/samples-uiplugins

3 2

[Engine-devel] UI Plugins: PoC patch revision 7 is here
by Vojtech Szocs 12 Dec '12

12 Dec '12

------=_Part_6244399_613158090.1352995860557 Content-Type: text/plain; charset=utf-8 Content-Transfer-Encoding: 7bit Hi guys, the latest revisi on of UI Plugins proof-of-c on cept patch is now available for you to experiment with. I've split revision 7 changes apart from revision 6 to make it easier to review new features that were added into revision 7. You can download and apply UI Plugins patches from oVirt Gerrit code review system: 1. revision 6 - http://gerrit.ovirt.org/#/c/8120/ 2. revision 7 - http://gerrit.ovirt.org/#/c/9250/ Please read on to learn what's new in this revisi on . If you have any comments, questi on s or ideas, please let me know! Engine REST API integration UiInit is not the only event handler function anymore! :) UI plugin infrastructure now integrates with Engine REST API by acquiring new REST API session [1] upon successful user authentication. REST API session ID is provided to plugins via RestApiSessionAcquired event handler function. For example: api.register({ RestApiSessionAcquired: function(sessionId) { // Do something with newly acquired session ID } }); Note that UiInit function is still the first function to be invoked on the given plugin. Plugins can therefore expect RestApiSessionAcquired function to be called shortly after UiInit function. For now, UI plugin infrastructure guarantees that acquired Engine REST API session will be valid while the user stays authenticated in WebAdmin. This is done by keeping REST API session alive via periodic heartbeats (HTTP requests) in the background. This also means that it's safe to store and use REST API session ID until RestApiSessionAcquired function is called again with new value. In future, we might consider dropping this kind of guarantee to avoid the keep-alive heartbeat, and use some kind of "is session valid" query to determine if the REST API session is still valid. After the user signs out of WebAdmin, Engine REST API session will be closed, as per [1]. After signing in again, the process of acquiring new REST API session and calling RestApiSessionAcquired function repeats with new session ID value. Engine REST API integration also works seamlessly with auto login - if the user is already logged in on the backend, running WebAdmin in new window (tab) will take him directly to the main (authenticated) section of the application. In this case, UI plugin infrastructure remembers the currently valid REST API session ID using HTML5 local storage (or cookie if the browser doesn't support it). New API function: showDialog It's now possible to open custom dialogs using showDialog function. For example: api.register({ UiInit: function() { api.addMainTabActionButton('Host', 'Show Test Dialog', { onClick: function() { api.showDialog('Test Dialog', 'http://www.ovirt.org/', 600, 400); } }); } }); The signature of showDialog function is following: showDialog (title, contentUrl, width, height) For now, dialogs are shown using window.open API (non-modal browser popups ). This will be changed in future, providing close integration with GWTP / WebAdmin dialog infrastructure. New API function: setMainTabContentUrl It's now possible to update content URL of the given custom main tab using setMainTabContentUrl function. For example: api.register({ UiInit: function() { // Use 'about:blank' URL to display empty content api.addMainTab('Custom Tab', 'custom-tab', 'about:blank'); }, RestApiSessionAcquired: function(sessionId) { var url = 'http://www.ovirt.org/?s=' + encodeURIComponent(sessionId); api.setMainTabContentUrl('custom-tab', url); } }); In the above example, we first add an empty custom main tab. We do this in UiInit event handler function because we know that it's the best place for one-time UI initialization :) As soon as we receive REST API session ID, we update the URL of the custom main tab. This is just an example how REST API session ID can be sent over to your server as part of main tab content URL. The signature of setMainTabContentUrl function is following: setMainTabContentUrl(historyToken, contentUrl) Note that historyToken essentially identifies the custom main tab. That's it for now, let me know what you think! Regards, Vojtech [1] http://wiki.ovirt.org/wiki/Features/RESTSessionManagement ------=_Part_6244399_613158090.1352995860557 Content-Type: text/html; charset=utf-8 Content-Transfer-Encoding: quoted-printable <html><head><style type=3D'text/css'>p { margin: 0; }</style></head><body><= div style=3D'font-family: times new roman,new york,times,serif; font-size: = 12pt; color: #000000'>Hi guys, the latest revision<= /span> of UI Plugins= proof-of-c<spa= n id=3D"DWT4665" class=3D"ZmSearchResult">oncept patch is now= available for you to experiment with. I've split revision 7 changes apart = from revision 6 to make it easier to review new features that were added in= to revision 7. You can download and apply UI Plugins patches from oV= irt Gerrit code review system: <ol><li>revision 6 - http://gerrit.ovirt.= org/#/c/8120/</li><li>revision 7 - http://gerrit.ovirt.org/#/c/9250/ </l= i></ol>Please read on to learn what's new = in this revision. If you have any comments, = questions or ideas, please let me know! <= br><hr style=3D"width: 100%; height: 2px;"> Engine REST API inte= gration UiInit is not= the only event handler function anymore! :) UI plugin infrastructur= e now integrates with Engine REST API by acquiring new REST API session [1]= upon successful user authentication. REST API session ID is provide= d to plugins via RestApiSessionAcquired= event handler function. For example: api.register({</span= >   RestApiSessionAcquired: function(sessionId) { &nbsp= ;   // Do something with newly acquired session ID &nbs= p; } }); Note that UiInit function is still the first function to be invoked on the= given plugin. Plugins can therefore expect RestApiSessionAcquired function to be called shortly after <spa= n style=3D"font-style: italic;">UiInit function. For now, UI = plugin infrastructure guarantees that acquired Engine REST API session will= be valid while the user stays authenticated in WebAdmin. This is done by k= eeping REST API session alive via periodic heartbeats (HTTP requests) in th= e background. This also means that it's safe to store and use REST API sess= ion ID until RestApiSessionAcquired</sp= an> function is called again with new value. In future, we might consider d= ropping this kind of guarantee to avoid the keep-alive heartbeat, and use s= ome kind of "is session valid" query to determine if the REST API session i= s still valid. After the user signs out of WebAdmin, Engine REST API= session will be closed, as per [1]. After signing in again, the process of= acquiring new REST API session and calling RestApiSessionAcquired function repeats with new session ID val= ue. Engine REST API integration also works seamlessly with auto logi= n - if the user is already logged in on the backend, running WebAdmin in ne= w window (tab) will take him directly to the main (authenticated) section o= f the application. In this case, UI plugin infrastructure remembers the cur= rently valid REST API session ID using HTML5 local storage (or cookie if th= e browser doesn't support it). <hr style=3D"width: 100%; height: 2px= ;"> New API function: showDialog</spa= n> It's now possible to open custom dia= logs using showDialog function. = For example: api.register({   UiInit: function() {=     api.addMainTabActionButton('Host', 'Show Test= Dialog', {       onClick: function() {<= /span>         api.showDialog('Test D= ialog', 'http://www.ovirt.org/', 600, 400);     &nbs= p; }     });   } });</spa= n> The signature of showDialog</spa= n> function is following: <div style=3D"margin-left: 40px;">showDialog(title, contentUrl, width, height)</s= pan> </div> For now, dialogs are shown using window.open API (non-modal browser popups). This will be= changed in future, providing close integration with GWTP / WebAdmin dialog= infrastructure. <hr style=3D"width: 100%; height: 2px;"> New API function: setMainTabContentUrl<b= r style=3D"font-weight: bold;"> It's now possible to update content URL = of the given custom main tab using setM= ainTabContentUrl function. For example: api.register({</sp= an>   UiInit: function() {     // Use 'abo= ut:blank' URL to display empty content     api.add= MainTab('Custom Tab', 'custom-tab', 'about:blank');   },</sp= an>   RestApiSessionAcquired: function(sessionId) { &nbsp= ;   var url =3D 'http://www.ovirt.org/?s=3D' + encodeURIComponent= (sessionId);     api.setMainTabContentUrl('custom-= tab', url);   } }); In the above exampl= e, we first add an empty custom main tab. We do this in UiInit event handler function because we know that = it's the best place for one-time UI initialization :) As soon as we receive= REST API session ID, we update the URL of the custom main tab. This is jus= t an example how REST API session ID can be sent over to your server as par= t of main tab content URL. The signature of setMainTabContentUrl function is following: <div = style=3D"margin-left: 40px;">setMainTab= ContentUrl(historyToken, contentUrl) </div> Note that historyToken essentially identifies the = custom main tab. <hr style=3D"width: 100%; height: 2px;"> That's = it for now, let me know what you think! Regards, Vojtech <= span style=3D"font-weight: bold;"> [1] http://wiki.ovirt.org/wiki= /Features/RESTSessionManagement </div></body></html> ------=_Part_6244399_613158090.1352995860557--

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