maiha

redis-cli -A secret get foo

19:27:55.413331:[S] ""
19:27:55.413375:[SA] ""
19:27:55.416550:[A] "......"
19:27:55.422557:[PA] "*2\r\n$4\r\nAUTH\r\n$6\r\nsecret\r\n"
19:27:55.422589:[A] ""
19:27:55.422641:[PA] "+OK\r\n"
19:27:55.428735:[PA] "*2\r\n$3\r\nget\r\n$3\r\nfoo\r\n"
19:27:55.428810:[PA] "-MOVED 12182 127.0.0.1:7001\r\n"

EtherHeader(MacHeader): 14bytes
IpHeader: 20bytes
TcpHeader: 20bytes

Data Storage

ElasticSearch

docker run --name elasticsearch -p 9200:9200 -p 9300:9300 elasticsearch

influxdb

https://hub.docker.com/_/influxdb/

compile error

cannot find -lpcre

in ubuntu

./bin/crystal build  -o .build/all_spec spec/all_spec.cr
Using compiled compiler at .build/crystal
/usr/bin/ld: cannot find -lpcre

	% gdb ./app core -ex bt
	(snip)
	[New LWP 27887]
	[Thread debugging using libthread_db enabled]
	Using host libthread_db library "/lib/x86_64-linux-gnu/libthread_db.so.1".
	Core was generated by `./app'.
	Program terminated with signal SIGSEGV, Segmentation fault.
	#0 0x0000000000000000 in ?? ()
	#0 0x0000000000000000 in ?? ()
	#1 0x00007fd8fe361a33 in __GI__dl_addr (

	# https://github.com/crystal-lang/crystal/issues/2990#issuecomment-232775971

	spawn do
	sleep 10
	ch.close
	end

	spawn do
	sleep 20
	ch.send 1 # => Exception

	# redis cluster ports
	alias rc='for x in `seq 7001 7003`'

	# create template
	cat > redis.conf
	cluster-enabled yes
	cluster-config-file nodes.conf
	cluster-node-timeout 5000
	^D

	% crystal build --release bench.cr

	% ./bench
	"127.0.0.1"
	"127.0.0.1"
	"127.0.0.1"
	"127.0.0.1"
	"127.0.0.1"
	"127:0:0:1"
	"127:0:0:1"

	http://hackerslab.aktsk.jp/other/redis_cluster_construction_method/
	http://www.walksocket.com/archives/343
	http://tech.kayac.com/archive/reconnect_redisfast.html
	http://qiita.com/uryyyyyyy/items/fc767f7f41144e5f10a1
	http://kakakikikeke.blogspot.jp/2015/08/add-node-redis-cluster.html

	% supervisorctl status
	kafka-manager RUNNING pid 17563, uptime 23:59:24
	kafka08-1 RUNNING pid 62016, uptime 0:40:45
	kafka08-2 STOPPED Jan 27 09:35 AM
	kafka08-3 STOPPED Jan 27 09:35 AM
	kafka08-4 RUNNING pid 27164, uptime 3:20:28
	kafka08-5 STOPPED Not started
	kafka09-1 STOPPED Jan 27 05:14 PM
	kafka09-2 RUNNING pid 45687, uptime 8:18:28
	kafka09-3 RUNNING pid 45760, uptime 8:18:07