TL;DR When defining networking on Proxmox 4 LXC containers, use an appropriate CIDR suffix (e.g. 24) - don’t use 32! On my Proxmox 4 server I’m running a whole load of lovely LXC containers. Unfortunately, I had trouble connecting to them. From a client machine, I got the error ssh_exchange_identification: read: Connection reset by peer On the server I was connecting to (which I could get a console for through the Proxmox GUI, or a session on using pct enter from the Proxmox host) I ran a SSHD process with debug to see what was happening:

Installing CDH 5.7 on Linux Containers (LXC) hosted on Proxmox 4. Everything was going well until Cluster Setup, and which point it failed on Start YARN (MR2 included) Completed only 0/1 steps. First failure: Failed to execute command Start on service YARN (MR2 Included) Log /var/log/hadoop-yarn/hadoop-cmf-yarn-NODEMANAGER-cdh57-01-node-02.moffatt.me.log.out showed: org.apache.hadoop.service.AbstractService: Service containers-monitor failed in state INITED; cause: java.lang.NumberFormatException: For input string: "18446744073709550364" java.lang.NumberFormatException: For input string: "18446744073709550364" Looking down the stack trace, this came from org.

(Previously, previously, previously) Since Proxmox 4 has a recent Linux kernel and mainline one at that, it means that Docker can be run on it. I’ve yet to really dig into Docker and work out when it makes sense in place of Linux Containers (LXC), so this is going to be a learning experience for me. To install Docker, add Backports repo to apt: root@proxmox01:~# cat /etc/apt/sources.list.d/backports.list deb http://ftp.debian.org/debian jessie-backports main And then install:

(Previously, previously) I’ve got a bunch of existing VirtualBox and VMWare VMs that I want to run on Proxmox. Eventually I’ll migrate them to containers, but for the time being run them as “fat” VMs using Proxmox’s KVM virtualisation. After copying the OVA files that I had to the server, I uncompressed them: root@proxmox01:/data04/vms/bdl44-biwa# cd ../bdl44 root@proxmox01:/data04/vms/bdl44# ll total 27249328 -rw------- 1 root root 27903306752 Jun 1 10:14 BigDataLite440.ova root@proxmox01:/data04/vms/bdl44# tar -xf BigDataLite440.

(Previously) With my server in place, I ran a memtest on it … which with 128G took a while ;) And then installed Proxmox 4, using a bootable USB that I’d created on my Mac from the ISO downloaded from Proxmox’s website. To create the bootable USB, create the img file: hdiutil convert -format UDRW -o target.img source.iso and then burn it to USB: sudo dd if=target.img of=/dev/rdiskN bs=1m Replace N with the correct device based on diskutil list output.

After a long and painful delivery, I’m delighted to announce the arrival of a new addition to my household … : This custom-build from Scan 3XS is sat in my study quietly humming away. I’m going to use it for hosting VMs for R&D on OBIEE, Big Data Lite, Elastic, InfluxDB, Kafka, etc. I’ll blog various installations that I’ve done on it as a reference for myself, and anyone else interested.