Simulating a DC move with tc

http://kindredmarketing.com/88602-accutane-cost.html augment I would first like to warn you that I am not a tc expert. In fact, I consider TC to be a form of black magic. That said I will do my best to explain to you what little I know – mostly because I know I will need this information in the future so it is important to write it down 😉

What is TC

http://thefitflightattendant.com/62237-hyaluronic-acid-uk.html settle tc is a way to interface with kernel level traffic control settings. You can shape incoming or outgoing traffic, however, incoming traffic shaping is very primitive and thus most of what I will show you is shaping traffic leaving your server destined for some other server

Why use TC

interface https://123-administratie.nl/76193-xarelto-price.html Simulate network lag, congestion, or other issues.
Personally, I have a situation where, for one of my products, the primary data center is just a few miles from the redundant data center. This worked out well, however, we just built a new shiny data center across the country and the space we are leasing so this product can be redundant has been deemed unnecessary. I can totally see this. However…

  • The product has app servers in each data center.
  • These app servers write to a common database in one datacenter
  • These app servers will occasional read from the master – no matter what DC houses it
  • These app servers will other wise read things they wrote from their own data center.

tizanidine price manufacture This means when we add some speed of light issues we may have trouble. So how do we test this and correct these troubles refer https://techrepeast.com/68237-singulair-uk.html before we move?

Basic shaping examples

these details tc qdisc add dev bond0 handle 1: root htb
tc class add dev bond0 parent 1:1 classid 1:11 htb rate 1000Mbps
tc class add dev bond0 parent 1:1 classid 1:12 htb rate 1000Mbps
tc qdisc add dev bond0 parent 1:11 handle 10: netem delay 200ms 100ms distribution normal
tc qdisc add dev bond0 parent 1:12 handle 20: netem loss 3%
tc filter add dev bond0 protocol ip prio 1 u32 match ip dst 10.10.208.0/21 flowid 1:11
tc filter add dev bond0 protocol ip prio 1 u32 match ip dst 10.10.208.0/21 flowid 1:12

rencontres et racines 2015 In the above…

Viewing and deleting existing rules

Viewing

site de rencontre 411 When viewing existing rules we will use tc -s {qdisc|class} ls for list. Show also works instead of ls depending on how you prefer to remember such things. The -s indicates show and you can just as easily do something like tc -s qdisc show dev eth0

their website [root@devsrv04 STG boneal]# tc -s qdisc ls
qdisc pfifo_fast 0: dev eth0 bands 3 priomap  1 2 2 2 1 2 0 0 1 1 1 1 1 1 1 1
..Sent 3233631430439 bytes 1623041258 pkt (dropped 0, overlimits 0 requeues 0)
..rate 0bit 0pps backlog 0b 0p requeues 0
qdisc htb 1: dev bond0 r2q 10 default 0 direct_packets_stat 401748689
..Sent 991209608724 bytes 983293850 pkt (dropped 19860, overlimits 542341718 requeues 0)
..rate 0bit 0pps backlog 0b 5p requeues 0
qdisc netem 10: dev bond0 parent 1:11 limit 1000 delay 200.0ms  100.0ms
..Sent 35467782723 bytes 78783479 pkt (dropped 0, overlimits 0 requeues 0)
..rate 0bit 0pps backlog 0b 5p requeues 0
qdisc netem 20: dev bond0 parent 1:12 limit 1000 loss 3%
..Sent 0 bytes 0 pkt (dropped 0, overlimits 0 requeues 0)
..rate 0bit 0pps backlog 0b 0p requeues 0

Deleting

flirten obwohl in beziehung Just use the del command, so tc qdisc del {root|ingress} dev {device}
You can also just delete all rules on a disk by issuing tc qdisk del

does anyone ever hook up from craigslist tc qdisc del root dev eth0

Class Vs Classless

singles eisenach thüringen I have to admit that I am uncertain about this. But i do know that for more complex layered filters you seem to either need to apply them to a class, or, layer them on a virtual interface.

dating sites elite singles In the end I need to do more research and testing on this

Structures

http://www.russianecho.net/?fioper=lieu-rencontre-41&f5d=63 Again, I need to do more research here – come back for updates

Some links I found useful

new york urban professional dating club new york ny http://tldp.org/HOWTO/Traffic-Control-HOWTO/

https://wiki.archlinux.org/index.php/Advanced_traffic_control

https://omf.mytestbed.net/projects/omf/wiki/NetEM_examples_of_rules

https://wiki.linuxfoundation.org/networking/netem#how_can_i_use_netem_on_incoming_traffic3f

reverting queu change

https://serverfault.com/questions/457354/resetting-a-queue-discipline-back-to-the-default-pfifo-fast-one

Visualization

http://ze.phyr.us/visualizing-linux-traffic-control-setup/

Appliance

http://wanem.sourceforge.net/

This post is dedicated to prior planning and finding out problems when you can roll back and fix at leisure. Instead of finding out problems when you have no choices. 🙂