https://pinboard.in/u:jm/public/ recent bookmarks from jm 2021-04-29T13:11:00+00:00 https://jimmysong.io/en/blog/sidecar-injection-iptables-and-traffic-routing/ jm kubernetes iptables sidecars istio service-mesh networking k8s eks routing https://pinboard.in/ https://pinboard.in/u:jm/b:3b0dfec4d9d9/ 2015-01-27T16:15:05+00:00 https://github.com/tylertreat/Comcast jm networking testing linux tc netem latency packet-loss iptables https://pinboard.in/ https://pinboard.in/u:jm/b:99e8ef481d50/ 2013-08-21T11:53:18+00:00 http://www.reddit.com/r/technology/comments/13kmvd/have_time_warner_internet_but_can_barely_stream/c750w8x jm streaming youtube caching isps caches firewalls iptables hacks video networking https://pinboard.in/ https://pinboard.in/u:jm/b:26bea514dd34/ 2013-06-14T10:39:37+00:00 https://github.com/mk-fg/graphite-metrics jmmetric collectors for various stuff not (or poorly) handled by other monitoring daemons Core of the project is a simple daemon (harvestd), which collects metric values and sends them to graphite carbon daemon (and/or other configured destinations) once per interval. Includes separate data collection components ("collectors") for processing of: /proc/slabinfo for useful-to-watch values, not everything (configurable). /proc/vmstat and /proc/meminfo in a consistent way. /proc/stat for irq, softirq, forks. /proc/buddyinfo and /proc/pagetypeinfo (memory fragmentation). /proc/interrupts and /proc/softirqs. Cron log to produce start/finish events and duration for each job into a separate metrics, adapts jobs to metric names with regexes. Per-system-service accounting using systemd and it's cgroups. sysstat data from sadc logs (use something like sadc -F -L -S DISK -S XDISK -S POWER 60 to have more stuff logged there) via sadf binary and it's json export (sadf -j, supported since sysstat-10.0.something, iirc). iptables rule "hits" packet and byte counters, taken from ip{,6}tables-save, mapped via separate "table chain_name rule_no metric_name" file, which should be generated along with firewall rules (I use this script to do that). Pretty exhaustive list of system metrics -- could have some interesting ideas for Linux OS-level metrics to monitor in future.]]> graphite monitoring metrics unix linux ops vm iptables sysadmin https://pinboard.in/ https://pinboard.in/u:jm/b:800442dc36d1/ 2012-01-05T22:41:48+00:00 https://grepular.com/Punching_through_The_Great_Firewall_of_TMobile jm china filtering rst internet iptables t-mobile uk payg mobile-internet https://pinboard.in/ https://pinboard.in/u:jm/b:c53894cccffc/