How can I see the error details and server log? ... View more

Thank you for giving the video link . It was very helpful. ... View more

umm... For 3 nodes Do I need 4 computers? 1com: localhost 2com: master 3com: slave1 4com: slave2 ... View more

I revised ect/hosts in to below 127.0.0.1 master.hadoop.com master 127.0.0.1 slave1.hadoop.com slave1 127.0.0.1 slave2.hadoop.com slave2 --------------------------------------------------- [root@localhost ~]# hostname localhost.localdomain [root@localhost ~]# hostname -f localhost Afert reboot CentOS7, hostname is changed. Do I change hostname every reboot? using this command "# hostname master.hadoop.com" ------------------------------------------------------------------------------ I generated SSH only in master node. because I have only 1 computer. If I want to use multi node, do I use multi computer? If it is, single node is OK. because purpose is to study --------------------------------------------------------------------------- [root@localhost ~]# ssh master The authenticity of host 'master (127.0.0.1)' can't be established. ECDSA key fingerprint is b8:c1:a1:6e:d6:85:12:aa:cc:96:1f:34:9c:61:90:9a. Are you sure you want to continue connecting (yes/no)? # yes Warning: Permanently added 'master' (ECDSA) to the list of known hosts. Last login: Wed Mar 22 15:59:27 2017 [root@localhost ~]# ssh slave1 The authenticity of host 'slave1 (127.0.0.1)' can't be established. ECDSA key fingerprint is b8:c1:a1:6e:d6:85:12:aa:cc:96:1f:34:9c:61:90:9a. Are you sure you want to continue connecting (yes/no)? # yes Warning: Permanently added 'slave1' (ECDSA) to the list of known hosts. Last login: Wed Mar 22 16:12:14 2017 from localhost [root@localhost ~]# ssh slave2 The authenticity of host 'slave2 (127.0.0.1)' can't be established. ECDSA key fingerprint is b8:c1:a1:6e:d6:85:12:aa:cc:96:1f:34:9c:61:90:9a. Are you sure you want to continue connecting (yes/no)? # yes Warning: Permanently added 'slave2' (ECDSA) to the list of known hosts. Last login: Wed Mar 22 16:12:27 2017 from localhost ... View more

OH. IT WORK. IT WORK THANK YOU Sooooooooooooooooooooooo much I LOVE YOU Sooooooooooooooooooooooo much in your last comment, is there UI that can see all status(firewall, iptables, etc.)? without terminal. today is my first time to use linux. so everything is not familiar with me. ... View more

I did below commands [root@localhost ~]# systemctl stop firewalld [root@localhost ~]# systemctl mask firewalld [root@localhost ~]# yum install iptables-services [root@localhost ~]# systemctl enable iptables [root@localhost ~]# systemctl restart iptables [root@localhost ~]# service iptables save Is it right? ... View more

this command([root@localhost ~]# service iptables stop) seems not working on CentOS 7 ... View more

Thank you for reading. Is this status right? or are there any problems? ... View more