Hadoop error starting start-all.sh (master: ssh: connect to host master port 22: Connection refused)
The following error occurs when we open the system to enter the hadoop startup command start-all.sh:
[root@master ~] # start-all.shstarting namenode, logging to / usr/local/hadoop/libexec/../logs/hadoop-root-namenode-master.outmaster: ssh: connect to host master port 22: Network is unreachablemaster: ssh: connect to host master port 22: Network is unreachablestarting jobtracker, logging to / usr/local/hadoop/libexec/../logs/hadoop-root-jobtracker-master.outmaster: ssh: connect to host master port 22: Network is unreachable
Let's look at the progress:
[root@master ~] # jps2739 Jps [root@master ~] #
Shows that our hadoop is not started.
My solution:
Let's first check that the ip of our current virtual machine system is 192.168.40.128
[root@master ~] # ifconfigeth2 Link encap:Ethernet HWaddr 00:0C:29:4E:BC:7A inet addr:192.168.40.128 Bcast:192.168.40.255 Mask:255.255.255.0 inet6 addr: fe80::20c:29ff:fe4e:bc7a/64 Scope:Link UP BROADCAST RUNNING MULTICAST MTU:1500 Metric:1 RX packets:127 errors:0 dropped:0 overruns:0 frame:0 TX Packets:134 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:1000 RX bytes:12497 (12.2 KiB) TX bytes:14291 (13.9 KiB) Interrupt:19 Base address:0x2024 lo Link encap:Local Loopback inet addr:127.0.0.1 Mask:255.0.0.0 inet6 addr: 1thumb 128 Scope:Host UP LOOPBACK RUNNING MTU : 16436 Metric:1 RX packets:24 errors:0 dropped:0 overruns:0 frame:0 TX packets:24 errors:0 dropped:0 overruns:0 carrier:0 collisions:0 txqueuelen:0 RX bytes:1616 (1.5 KiB) TX bytes:1616 (1.5 KiB)
Then we edit and view the configuration in the / etc/hosts file:
127.0.0.1 localhost localhost.localdomain localhost4 localhost4.localdomain4::1 localhost localhost.localdomain localhost6 localhost6.localdomain6192.168.80.100 master#hadoop ip configuration ~ ~ ~ "/ etc/hosts" 3L 180C
We can see that the ip configuration of master,hadoop is 192.168.80.100, which is inconsistent with the ip of the current system. Keyboard press I to edit and modify ip to the current system ip (192.168.40.128), press esc to enter: wq to exit saving. Then restart start-all.sh
[root@master ~] # start-all.shstarting namenode, logging to / usr/local/hadoop/libexec/../logs/hadoop-root-namenode-master.outmaster: Warning: Permanently added the RSA host key for IP address' 192.168.40.128' to the list of known hosts.master: starting datanode, logging to / usr/local/hadoop/libexec/../logs/hadoop-root-datanode-master.outmaster: starting secondarynamenode, logging to / usr/local/hadoop/libexec/../logs/hadoop-root-secondarynamenode-master.outstarting jobtracker Logging to / usr/local/hadoop/libexec/../logs/hadoop-root-jobtracker-master.outmaster: starting tasktracker, logging to / usr/local/hadoop/libexec/../logs/hadoop-root-tasktracker-master.out
Start successfully, view the process
[root@master ~] # jps3065 SecondaryNameNode3400 Jps3146 JobTracker2951 DataNode2843 NameNode3260 TaskTracker
Success
