realfirst

SSH-Agent

sudo aura -A envoy-git sudo systemctl enable [email protected]

envoy -t ssh-agent -a ssh_key

eval "$(envoy -p)"

check rpm file info rpm -qip /tmp/zookeeper-3.4.5-2.x86_64.rpm
building rpm srpm http://www.owlriver.com/tips/non-root/
rhel 7 close firewall On Redhat 7 Linux system the firewall run as firewalld daemon

systemctrl stop firewalld

check the disk space on each node in your cluster

curl -s 'localhost:9200/_cat/allocation?v'

curl -XGET 'localhost:9200/_cat/nodes?v&pretty' curl 'localhost:9200/_cluster/health?pretty'

use python yum module to get os $releasever and $basearch for yum repository python -c 'import yum, pprint; yb = yum.YumBase(); pprint.pprint(yb.conf.yumvar, width=1)'
only sysnc package of newest from remote repository reposync --newest-only -r repo-id
change linux os default default reoute sudo ip route replace default via 10.0.2.2 dev eth0

hive -hiveconf hive.root.logger=DEBUG,console

	my arch system has installed nearly four years.

	because systemd make a lot of change and i find my mpd and ssh-agent can not work as use service

	when i run
	```
	systemctl --user
	```
	return bus file not exist

	// ch5
	val rawData = sc.textFile("file:///search/dje/spark-ml/train_noheader.tsv")
	val records = rawData.map(line => line.split("\t"))
	records.first()

	import org.apache.spark.mllib.regression.LabeledPoint
	import org.apache.spark.mllib.linalg.Vectors
	val data = records.map { r =>
	val trimmed = r.map(_.replaceAll("\"",""))
	val label = trimmed(r.size - 1).toInt

	SELECT User,Host FROM mysql.user;

	DROP USER 'testuser'@'localhost';

	* MySql export schema without data
	mysqldump -u root -p --no-data dbname > schema.sql
	mysqldump -u root -p --no-data azkaban > azkaban-schema.sql


	* how-to-import-an-sql-file-using-the-command-line-in-mysql

	JsonNode node = mapper.readValue("[{\"listed_count\":1720,\"status\":{\"retweet_count\":78}}]]", JsonNode.class);

	System.out.println(node.findValues("retweet_count").get(0).asInt());