安裝Hadoop一定要安裝ssh-keygen嗎？
本人親自實踐，發現如果沒有像視頻中執行以下兩條重要命令，無法啟動：
ssh-keygen?-t?rsa cat?~/.ssh/id_rsa.pub?>>?~/.ssh/authorized_keys
一直報錯的內容如下：
[root@lb-chen?sbin]#?./start-all.sh? Starting?namenodes?on?[lb-chen]? Last?login:?Sat?Dec?21?17:46:44?CST?2019?on?pts/0? lb-chen:?Permission?denied?(publickey,gssapi-keyex,gssapi-with-mic,password).? Starting?datanodes? Last?login:?Sat?Dec?21?17:52:06?CST?2019?on?pts/0? localhost:?Permission?denied?(publickey,gssapi-keyex,gssapi-with-mic,password).? Starting?secondary?namenodes?[lb-chen]? Last?login:?Sat?Dec?21?17:52:07?CST?2019?on?pts/0? lb-chen:?Permission?denied?(publickey,gssapi-keyex,gssapi-with-mic,password).? Starting?resourcemanager? Last?login:?Sat?Dec?21?17:52:08?CST?2019?on?pts/0? Starting?nodemanagers? Last?login:?Sat?Dec?21?17:52:11?CST?2019?on?pts/0? localhost:?Permission?denied?(publickey,gssapi-keyex,gssapi-with-mic,password).
請問這個ssh 是一定要的嗎，是不是可以不用安裝這個？
還請大神求助，老師求助！SOS
2019-12-23
執行ssh-keygen是為了做免密碼登錄的，因為hadoop在啟動的時候默認會使用ssh 命令免密碼登錄到對應的機器啟動集群的相關服務，不管是單機還是集群都是這個流程