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<div class="WordSection1">
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">Hello CRIU team,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">My name is Frederic Huve working as a solution architect in the HPE Telco vertical. I’m following CRIU project since end of 2015 when the
<i>“Leveraging Linux Containers to Achieve High Availability for Cloud Services, Li et al., 2015</i>” white paper was published.
<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">We’ve started since 6 months an internal technology project aimed to figure out if this technology can be used for one of our HPE Telco product. First results are very positive with Docker
17.03.0-ce & CRIUv2.3, and we’d like to move forward in the investigation, in order to do so we have some key questions we’d like to ask.<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">Background<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpFirst" style="text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;line-height:106%"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;line-height:106%">Basically this HPE product is a Telecom Application server running in container like Docker based on Wildfly, it is executing applications that are on one side connected to the Telco
networks via IP protocols using UDP, TCP (SCTP) transport and on the other side connected to databases, or enterprises back-ends via the same transport protocols.
<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;line-height:106%"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;line-height:106%">We’d like to use Docker C/R feature based on CRIU (alternative is to use directly CRIU with the Java Machine Process) to achieve Fault-Tolerance (FT), so a bit different from classical
Live Migration use-case.<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpLast" style="text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;line-height:106%"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;line-height:106%">The objective is to periodically checkpoint the container, and if an error/failure occurs, restore the container on the same or another similar node based on the latest complete
checkpoint file. <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">Questions<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpFirst" style="text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;line-height:106%"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;line-height:106%">Do you believe that CRIU software is appropriate to achieve such FT feature?<o:p></o:p></span></p>
<p class="MsoListParagraphCxSpMiddle" style="text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;line-height:106%"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;line-height:106%">We observed that during the checkpoint operation, the container is “completely frozen” for the overall operation duration. Unfortunately the telecom protocols are quite timing sensitive
(e.g. protocol stack timer). Therefore it is critical to slice the checkpoint operation execution (that will take longer overall, but give the possibility to container to handle timers or network Events in between the checkpoint slice) like the incremental
dump operation, or maybe other optimization that are not yet public? <o:p></o:p></span></p>
<p class="MsoListParagraphCxSpLast" style="text-indent:-.25in;mso-list:l0 level1 lfo1">
<![if !supportLists]><span style="font-size:10.0pt;line-height:106%"><span style="mso-list:Ignore">-<span style="font:7.0pt "Times New Roman"">
</span></span></span><![endif]><span style="font-size:10.0pt;line-height:106%">If so, for a 2G RAM Container what would be your bet on the minimal “frozen time slice” duration?<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">We’re currently working on a 2<sup>nd</sup> version of the CRIU Proof of concept aimed to checkpoint a container, stop it, and restore it on the same HW server running CentOS 7.4 and latest
Docker & CRIU versions (PLs find below Docker & CRIU version info). Looks simple but we’re facing issues on the filesystem side (probably because of temporary files created, we’re still investigating), what’s would be the simplest setup in order to succeed
rapidly? <o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">Really appreciated your help to guide us in the right direction!<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">Thanks,<o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%">Fred<o:p></o:p></span></p>
<div class="MsoNormal" align="center" style="text-align:center"><span style="font-size:10.0pt;line-height:106%">
<hr size="2" width="100%" align="center">
</span></div>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">[root@cgcriu ~]# uname -a</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span lang="FR" style="font-size:9.0pt;color:black">Linux cgcriu 3.10.0-693.el7.x86_64 #1 SMP Tue Aug 22 21:09:27 UTC 2017 x86_64 x86_64 x86_64 GNU/Linux
</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span lang="FR" style="font-size:9.0pt"><o:p> </o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span lang="FR" style="font-size:9.0pt;color:black"></span><span style="font-size:9.0pt;color:black">[root@cgcriu ~]# docker info</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Containers: 1</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Running: 1</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Paused: 0</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Stopped: 0</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Images: 7</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Server Version: 17.09.0-ce</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Storage Driver: overlay2</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Backing Filesystem: xfs</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Supports d_type: true</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Native Overlay Diff: true</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Logging Driver: json-file</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Cgroup Driver: cgroupfs</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Plugins:</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Volume: local</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Network: bridge host ipvlan macvlan null overlay</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> Log: awslogs fluentd gcplogs gelf journald json-file logentries splunk syslog</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Swarm: inactive</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Runtimes: runc</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Default Runtime: runc</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Init Binary: docker-init</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">containerd version: 06b9cb35161009dcb7123345749fef02f7cea8e0</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">runc version: 3f2f8b84a77f73d38244dd690525642a72156c64</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">init version: 949e6fa</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Security Options:</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black"> </span><span lang="FR" style="font-size:9.0pt;color:black">seccomp</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span lang="FR" style="font-size:9.0pt;color:black"> Profile: default</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span lang="FR" style="font-size:9.0pt;color:black">Kernel Version: 3.10.0-693.el7.x86_64</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">Operating System: CentOS Linux 7 (Core)</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal" style="mso-margin-top-alt:2.0pt;margin-right:0in;margin-bottom:2.0pt;margin-left:0in;line-height:normal;text-autospace:none">
<span style="font-size:9.0pt;color:black">OSType: linux</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Architecture: x86_64</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">CPUs: 32</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Total Memory: 110GiB</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Name: cgcriu</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">ID: PT2D:X72Q:KFLE:NXTZ:P7BB:FXKV:L4QI:MSA6:KLT5:HRPL:XJ5I:NICA</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Docker Root Dir: /var/lib/docker</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:9.0pt;color:black">Debug Mode (client): false</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:9.0pt;color:black">Debug Mode (server): false</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Registry: </span><span style="font-size:9.0pt">https://index.docker.io/v1/<o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Experimental: true</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Insecure Registries:</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black"> 127.0.0.0/8</span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">Live Restore Enabled: false </span><span style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt"> <o:p></o:p></span></p>
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<span lang="FR" style="font-size:9.0pt;color:black">[root@cgcriu ~]# criu -V</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
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<span lang="FR" style="font-size:9.0pt;color:black">Version: 3.7</span><span lang="FR" style="font-size:9.0pt"><o:p></o:p></span></p>
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<span style="font-size:9.0pt;color:black">GitID: v3.7 </span><span style="font-size:9.0pt"><o:p></o:p></span></p>
<p class="MsoNormal"><span style="font-size:10.0pt;line-height:106%"><o:p> </o:p></span></p>
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