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1. Linux/FreeBSD
2. Apache
3. MySQL
4. PHP
5. Nagios
6. MRTG
7. Perl
8. Shell Script
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A. Function as a technical generalist responsible for the overall health and performance of our many web applications and cloud services
B. Develop tools by scripts (shell scripts, Perl, python, …etc) to automate the deployment, administration, and monitoring of a large-scale Linux and FreeBSD environments on different global locations.
C. Gain deep application-level knowledge of the systems as well as contributing to their overall design
D. Work with development teams to harden, enhance, document, establish process and generally improve the operability of our systems
E. Assist in the configuration/build-out of new deployments to facilitate our constant growth
F. Participate in a global support of on-call pager rotation
Common Tech Skills for Search Cloud Service Engineering
Boot Process and Configs
Areas
BIOS, POST
Remote on/off Machines / Remote Boot
MBR, GRUB, Lilo.
Kernel device probing, root mount
init process, run levels
configs of apache, dns, network, …etc
Perl
a hash and/or hashing function works.
Sorting of arrays and hashes.
Recursive functions
Plus: Advanced Perl
Shell Scripting
Areas
Bash / Commands
Write an init scrip..
Awk, sed, regular expression.
Pipe, redirect
If, loop, case, …
Monitoring, Alerting and Nagios
Areas
nrpe,
RTTS/Uranus,
Plus: Cacti, ganglia, cricket, etc.
Plus: Gomez or Keynote or other such tools
Troubleshooting
Areas
df show partition is full, you delete a file, df still shows full. What's going on?
Web performance is slow. What do you do? (Network, system, app, DB, etc. troubleshooting.)
Disk is "slow" what might you look at? iostat, dmesg to see if the disk is dying, etc.
Network is slow. What do you look at? duplex, saturation, etc.
Unix Internals
Areas
Fork()
Paging, swapping. How to tell what's occurring (vmstat, etc.) Ill-effects of paging.
How typical FFS based filesystems work. Cylinder groups, inodes, data blocks, indirect blocks, super blocks.
log/extents/journal based filesystems
inodes and dirents.
symlinks and hardlinks.
/proc/ filesystem.
Block devices vs. raw devices.
FIFOs, regular files, …etc.
sysctl and other tunables
IPC
Networking/DNS
Areas
how DNS works. Recursive vs. iterative. Zones. Record types.
Socket, bind, …etc
nsswitch.conf, /etc/hosts, resolv.conf.
network performance tuning.
SACK and interface aggregation.
Deeper network topics like 802.1Q, core/aggregation|distribution/access switch infrastructure, BGP, OSPF, etc.
Discussion of load balancing techniques. like DSR, SNAT, etc.
Healthchecking
TCP packets, IP packets, ethernet frames
ARP and RARP, switches , routers.
Hardware, RAID, misc.
Areas
RAID levels.
Difference between 32-bit and 64-bit architectures.
Software RAID vs. Hardware RAID.
SAN vs. NAS.
…
Infrastructure and Architecture
Areas
A typical three tier web site architecture
Concerns to design an architecture
GSLB (akadns, brooklyn), failover, BCP.
Capacity planning
…
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