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This Is an Example of a Long Presentations Title Flowing To Xen Containers: Better way to run Docker Containers Sainath Grandhi [email protected] Contributions: Jun Nakajima 1 Motivation “Containers” being adopted for application development/deploying Containers looked upon as lightweight alternative for traditional VMs VMs offer stronger application isolation Benefits of VMs can be reaped if they are made lightweight and run like containers 2 Agenda Containers Xen Containers Numbers Next Steps 3 Namespaces Namespaces Namespaces Container A Container B Container C Container D Application Application Application Application Middleware Middleware Middleware Middleware Libraries Libraries Libraries Libraries Cgroups Namespaces Union FS Host OS Server Hardware 4 4 Docker Containers Docker – a one stop solution for running, building and packaging containers Running Container A • docker run/create/stop Building Application • docker build Docker Packaging client Middleware Libraries • docker push/pull/commit Docker Parent/child command Docker Docker daemon image Cgroups Namespaces Union FS Host OS 5 Bare metal containers - Isolation Isolation provided by Host OS Security compromised kernel can be exploited by malicious images/applications for namespace Namespaces intrusion Container A Container B Enabling cgroups and namespaces in the kernel increases the kernel attack surface Malicious public images Application Application Over 30% of Official Images in Docker Hub Contain High Priority Security Vulnerabilities Middleware Middleware http://www.banyanops.com/blog/analyzing-docker-hub/ Libraries Libraries Multi-tenant Cloud Providers Google: “we see the VM as the only truly safe isolation.… Until we see foolproof security for containers, we will always double-bag our customers' workloads” http://www.informationweek.com/cloud/infrastructure-as-a- service/google-docker-does-containers-right/d/d-id/1319146 6 Agenda Containers Xen Containers Numbers Next Steps 7 Containers Namespaces Namespaces Namespaces Container A Container B Container C Container D Application Application Application Application Middleware Middleware Middleware Middleware Libraries Libraries Libraries Libraries Cgroups Namespaces Union FS Host OS Server Hardware 8 8 VM Containers VM VM VM Container Container Container A Container B Application Application Application Application Middleware Middleware Middleware Middleware Libraries Libraries Libraries Libraries Cgroups Union FS Host OS/Dom0 Hypervisor Server Hardware 9 9 Xen PVH Containers • VM containers good for multi-tenant cloud providers Group containers from a tenant onto a VM • Great infrastructure in place for guest isolation • PVH for app containers Boot to guest kernel in protected mode PV performance for disk and network Hardware virtualized performance for CPU and memory • Why PVH (vs. HVM) No dependence on QEMU No BIOS Faster Boot time 10 Xen Containers with Docker Dom0 PVH DomU Docker client Application Docker Init User Daemon User Kernel Kernel Docker storage Container devices Root device vNIC Xen- Xen- Xen- Xen- blkback netback blkfront netfront Hypervisor Server Hardware 11 Xen Containers with Docker – Guest Anatomy Minimal Kernel PVH DomU Minimally configured kernel Application Init Init Init service to mount application rootfs and User configure network Kernel Container Root device vNIC Storage Docker container volume as rootfs Xen- Xen- blkfront netfront Networking Docker subnet IP and docker bridge gateway 12 Xen Containers with Docker – Guest Configuration Storage k Container e i Docker devicemapper block device r n Application PVH storage backend – container n i DomU volume Dom0 e t Docker host /bin/bash l Application path IP:172.17. xx.xx Application path from docker run docker run/exec command ubuntu Network IP /bin/bash DHCP/docker subnet for interoperability with docker containers 13 Agenda Containers Xen Containers Numbers Next Steps 14 Numbers PVH HVM Comments Domain 224 184 Time spent by xl toolstack to Creation setup domain To drop into 1380 2503 Time taken to boot the container shell minimal kernel and drop into shell from container rootfs Guest Memory Used – 16MB Config: Host Guest Xeon® CPU E5-2699 v3 Memory – 128MB Memory – 60GB vCPU - 1 Dom0 Memory – 4GB Dom0 vCPUs – 8 15 Agenda Containers Xen Containers Numbers Next Steps 16 Next Steps Docker Volumes PV VirtFS for supporting docker volumes Pods (Multiple applications in a VM) Leverage systemd as the init service inside VM to resource control multiple applications 17 Q & A.
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