sunhay

Kubectl output options

Let's look at some basic kubectl output options.

Our intention is to list nodes (with their AWS InstanceId) and Pods (sorted by node).

We can start with:

kubectl get no

sunhay

Taken from: https://github.com/opencontainers/runc/blob/master/libcontainer/devices/devices.go

```
$ go get -u github.com/opencontainers/runc
$ go get -u golang.org/x/sys/unix
```

sunhay

#!/bin/sh

echo () { printf "%s\n" "$*" ; }
fail () { echo "$*" ; exit 1 ; }
fnmatch () { eval "case \"\$2\" in $1) return 0 ;; *) return 1 ;; esac" ; }
cmdexists () { type "$1" >/dev/null 2>&1 ; }
trycc () { test -z "$CC" && cmdexists "$1" && CC=$1 ; }

printf "checking for C compiler... "
trycc ${CROSS_COMPILE}gcc

sunhay

Setting up linux headers for musl and golang

Example

$ ./setup_linux_headers
$ CGO_CFLAGS="-I/kernel-headers/include" CC='/usr/local/musl/bin/musl-gcc' go build -a --ldflags '-linkmode external -extldflags "-static"' main.go

sunhay

{
  "args": [
    "/usr/bin/lxcfs",
    "/var/lib/lxcfs/"
  ],
  "ppid": 1
}
{
  "args": [
    "/sbin/iscsid"

sunhay

#include <uapi/linux/ptrace.h>
#include <uapi/linux/if_packet.h>
#include <net/sock.h>
#include <bcc/proto.h>

#define IP_TCP 	6
#define ETH_HLEN 14

struct Key {
	u32 src_ip;               // source ip

sunhay

MacBook Pro (13-inch, 2017)
Intel(R) Core(TM) i7-7567U CPU @ 3.50GHz
16 GB 2133 MHz LPDDR3

$ go test -bench=.
goos: darwin
goarch: amd64

sunhay

package bitsbench

import (
	dbits "github.com/dgryski/go-bits"
	"math/bits"
	"testing"
)

// Modelled after https://github.com/golang/go/blob/master/src/math/bits/bits_test.go