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From "Armand Grillet (JIRA)" <j...@apache.org>
Subject [jira] [Updated] (MESOS-8414) DockerContainerizerTest.ROOT_DOCKER_Logs fails on CentOS 6
Date Mon, 15 Jan 2018 11:45:00 GMT

     [ https://issues.apache.org/jira/browse/MESOS-8414?page=com.atlassian.jira.plugin.system.issuetabpanels:all-tabpanel
]

Armand Grillet updated MESOS-8414:
----------------------------------
    Description: 
You can find the verbose logs attached.

The most interesting part:
{code:java}
I0108 16:35:45.887037 17805 sched.cpp:897] Received 1 offers
I0108 16:35:45.887070 17805 sched.cpp:921] Scheduler::resourceOffers took 12130ns
I0108 16:35:45.985957 17808 docker.cpp:349] Unable to detect IP Address at 'NetworkSettings.Networks.host.IPAddress',
attempting deprecated field
I0108 16:35:45.986428 17809 task_status_update_manager.cpp:328] Received task status update
TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.986552 17809 task_status_update_manager.cpp:383] Forwarding task status update
TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to the agent
I0108 16:35:45.986654 17809 slave.cpp:5209] Forwarding the update TASK_FAILED (Status UUID:
7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to master@172.16.10.110:37252
I0108 16:35:45.986795 17809 slave.cpp:5102] Task status update manager successfully handled
status update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of
framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.986829 17809 slave.cpp:5118] Sending acknowledgement for status update TASK_FAILED
(Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to executor(1)@172.16.10.110:38499
I0108 16:35:45.986901 17805 master.cpp:7890] Status update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00)
for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 from agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
at slave(1)@172.16.10.110:37252 (ip-172-16-10-110.ec2.internal)
I0108 16:35:45.986928 17805 master.cpp:7946] Forwarding status update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.986984 17805 master.cpp:10193] Updating the state of task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
(latest state: TASK_FAILED, status update state: TASK_FAILED)
I0108 16:35:45.987047 17805 sched.cpp:990] Received status update TASK_FAILED (Status UUID:
7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
from slave(1)@172.16.10.110:37252
I0108 16:35:45.987103 17805 sched.cpp:1029] Scheduler::statusUpdate took 30948ns
I0108 16:35:45.987112 17805 sched.cpp:1048] Sending ACK for status update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to master@172.16.10.110:37252
I0108 16:35:45.987221 17805 master.cpp:5826] Processing ACKNOWLEDGE call 7f544700-215b-4d27-ab43-b48e19592d00
for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 (default) at scheduler-4ad5073e-c1db-4c34-9c43-e656c280a724@172.16.10.110:37252
on agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
I0108 16:35:45.987267 17805 master.cpp:10299] Removing task 1 with resources cpus(allocated:
*):2; mem(allocated: *):1024; disk(allocated: *):1024; ports(allocated: *):[31000-32000] of
framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 on agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
at slave(1)@172.16.10.110:37252 (ip-172-16-10-110.ec2.internal)
I0108 16:35:45.987473 17807 task_status_update_manager.cpp:401] Received task status update
acknowledgement (UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.987561 17807 task_status_update_manager.cpp:538] Cleaning up status update
stream for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.987814 17807 slave.cpp:3974] Task status update manager successfully handled
status update acknowledgement (UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.987849 17807 slave.cpp:8935] Completing task 1
{code}
After further testing, [https://github.com/apache/mesos/blob/51a3bd95bd2d740a39b55634251abeadb561e5c8/src/docker/docker.cpp#L384]
appears to never be reached as {{ipAddressValue->value}} is an empty string.

What happens according to {{docker logs}}:
{code:java}
The system has no more ptys.  Ask your system administrator to create more.
    while executing
"spawn -noecho echo out849cd741-4ba7-429c-979f-da5cb0b16e0c"
    ("eval" body line 1)
    invoked from within
"eval [list spawn -noecho] $argv"
    invoked from within
"if {[string compare [lindex $argv 0] "-p"] == 0} {
    # pipeline
    set stty_init "-echo"
    eval [list spawn -noecho] [lrange $argv 1 end]
    clo..."
    (file "/usr/bin/unbuffer" line 13)
The system has no more ptys.  Ask your system administrator to create more.
    while executing
"spawn -noecho echo err849cd741-4ba7-429c-979f-da5cb0b16e0c"
    ("eval" body line 1)
    invoked from within
"eval [list spawn -noecho] $argv"
    invoked from within
"if {[string compare [lindex $argv 0] "-p"] == 0} {
    # pipeline
    set stty_init "-echo"
    eval [list spawn -noecho] [lrange $argv 1 end]
    clo..."
    (file "/usr/bin/unbuffer" line 13)
{code}
Removing the {{unbuffer}} in the commands in  [https://github.com/apache/mesos/blob/9c03a463c1ac8f63dc00255945a04016c45f04e9/src/tests/containerizer/docker_containerizer_tests.cpp#L2150-L2151]
solve the issue but they are here for a reason: [https://reviews.apache.org/r/43963] The
test, without {{unbuffer}}, has been successful even when running 100 times using {{GLOG_v=2
sudo ./mesos-tests.sh --gtest_filter="DockerContainerizerTest.ROOT_DOCKER_Logs" --gtest_break_on_failure
--gtest_repeat=100 --verbose}}.

The command can be reproduced without using Mesos on Centos 6 (using Docker version 1.7.1,
build 786b29d) :
{code:java}
[centos@ip-10-16-234-12 bin]$ sudo docker run -i -t mesosphere/alpine-expect /bin/sh
/ # unbuffer echo mesos
The system has no more ptys. Ask your system administrator to create more.
while executing
"spawn -noecho echo mesos"
("eval" body line 1)
invoked from within
"eval [list spawn -noecho] $argv"
invoked from within
"if {[string compare [lindex $argv 0] "-p"] == 0} {
# pipeline
set stty_init "-echo"
eval [list spawn -noecho] [lrange $argv 1 end]
clo..."
(file "/usr/bin/unbuffer" line 13)
/ # echo mesos
mesos{code}
By default, \{{unbuffer}} is not installed on CentOS 6. Installing it does not resolve the
issue but the command works on CentOS 6:
{code:java}
[centos@ip-10-16-234-12 bin]$ sudo yum install expect
[centos@ip-10-16-234-12 bin]$ unbuffer echo mesos
mesos{code}

  was:
You can find the verbose logs attached.

The most interesting part:
{code:java}
I0108 16:35:45.887037 17805 sched.cpp:897] Received 1 offers
I0108 16:35:45.887070 17805 sched.cpp:921] Scheduler::resourceOffers took 12130ns
I0108 16:35:45.985957 17808 docker.cpp:349] Unable to detect IP Address at 'NetworkSettings.Networks.host.IPAddress',
attempting deprecated field
I0108 16:35:45.986428 17809 task_status_update_manager.cpp:328] Received task status update
TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.986552 17809 task_status_update_manager.cpp:383] Forwarding task status update
TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to the agent
I0108 16:35:45.986654 17809 slave.cpp:5209] Forwarding the update TASK_FAILED (Status UUID:
7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to master@172.16.10.110:37252
I0108 16:35:45.986795 17809 slave.cpp:5102] Task status update manager successfully handled
status update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of
framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.986829 17809 slave.cpp:5118] Sending acknowledgement for status update TASK_FAILED
(Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to executor(1)@172.16.10.110:38499
I0108 16:35:45.986901 17805 master.cpp:7890] Status update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00)
for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 from agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
at slave(1)@172.16.10.110:37252 (ip-172-16-10-110.ec2.internal)
I0108 16:35:45.986928 17805 master.cpp:7946] Forwarding status update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.986984 17805 master.cpp:10193] Updating the state of task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
(latest state: TASK_FAILED, status update state: TASK_FAILED)
I0108 16:35:45.987047 17805 sched.cpp:990] Received status update TASK_FAILED (Status UUID:
7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
from slave(1)@172.16.10.110:37252
I0108 16:35:45.987103 17805 sched.cpp:1029] Scheduler::statusUpdate took 30948ns
I0108 16:35:45.987112 17805 sched.cpp:1048] Sending ACK for status update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to master@172.16.10.110:37252
I0108 16:35:45.987221 17805 master.cpp:5826] Processing ACKNOWLEDGE call 7f544700-215b-4d27-ab43-b48e19592d00
for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 (default) at scheduler-4ad5073e-c1db-4c34-9c43-e656c280a724@172.16.10.110:37252
on agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
I0108 16:35:45.987267 17805 master.cpp:10299] Removing task 1 with resources cpus(allocated:
*):2; mem(allocated: *):1024; disk(allocated: *):1024; ports(allocated: *):[31000-32000] of
framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 on agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
at slave(1)@172.16.10.110:37252 (ip-172-16-10-110.ec2.internal)
I0108 16:35:45.987473 17807 task_status_update_manager.cpp:401] Received task status update
acknowledgement (UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.987561 17807 task_status_update_manager.cpp:538] Cleaning up status update
stream for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.987814 17807 slave.cpp:3974] Task status update manager successfully handled
status update acknowledgement (UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
I0108 16:35:45.987849 17807 slave.cpp:8935] Completing task 1
{code}
After further testing, [https://github.com/apache/mesos/blob/51a3bd95bd2d740a39b55634251abeadb561e5c8/src/docker/docker.cpp#L384]
appears to never be reached as {{ipAddressValue->value}} is an empty string.

What happens according to {{docker logs}}:
{code:java}
The system has no more ptys.  Ask your system administrator to create more.
    while executing
"spawn -noecho echo out849cd741-4ba7-429c-979f-da5cb0b16e0c"
    ("eval" body line 1)
    invoked from within
"eval [list spawn -noecho] $argv"
    invoked from within
"if {[string compare [lindex $argv 0] "-p"] == 0} {
    # pipeline
    set stty_init "-echo"
    eval [list spawn -noecho] [lrange $argv 1 end]
    clo..."
    (file "/usr/bin/unbuffer" line 13)
The system has no more ptys.  Ask your system administrator to create more.
    while executing
"spawn -noecho echo err849cd741-4ba7-429c-979f-da5cb0b16e0c"
    ("eval" body line 1)
    invoked from within
"eval [list spawn -noecho] $argv"
    invoked from within
"if {[string compare [lindex $argv 0] "-p"] == 0} {
    # pipeline
    set stty_init "-echo"
    eval [list spawn -noecho] [lrange $argv 1 end]
    clo..."
    (file "/usr/bin/unbuffer" line 13)
{code}
Removing the {{unbuffer}} in the commands in  [https://github.com/apache/mesos/blob/9c03a463c1ac8f63dc00255945a04016c45f04e9/src/tests/containerizer/docker_containerizer_tests.cpp#L2150-L2151]
solve the issue but they are here for a reason: [https://reviews.apache.org/r/43963] The
test, without {{unbuffer}}, has been successful even when running 100 times using {{GLOG_v=2
sudo ./mesos-tests.sh --gtest_filter="DockerContainerizerTest.ROOT_DOCKER_Logs" --gtest_break_on_failure
--gtest_repeat=100 --verbose}}.


> DockerContainerizerTest.ROOT_DOCKER_Logs fails on CentOS 6
> ----------------------------------------------------------
>
>                 Key: MESOS-8414
>                 URL: https://issues.apache.org/jira/browse/MESOS-8414
>             Project: Mesos
>          Issue Type: Bug
>          Components: test
>         Environment: CentOS 6, Docker version 1.7.1, build 786b29d
>            Reporter: Armand Grillet
>            Assignee: Armand Grillet
>            Priority: Major
>         Attachments: centos6-ssl-DockerContainerizerTest.ROOT_DOCKER_Logs.txt, centos6-vlog2.txt,
docker-inspect.json, docker-logs.txt
>
>
> You can find the verbose logs attached.
> The most interesting part:
> {code:java}
> I0108 16:35:45.887037 17805 sched.cpp:897] Received 1 offers
> I0108 16:35:45.887070 17805 sched.cpp:921] Scheduler::resourceOffers took 12130ns
> I0108 16:35:45.985957 17808 docker.cpp:349] Unable to detect IP Address at 'NetworkSettings.Networks.host.IPAddress',
attempting deprecated field
> I0108 16:35:45.986428 17809 task_status_update_manager.cpp:328] Received task status
update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
> I0108 16:35:45.986552 17809 task_status_update_manager.cpp:383] Forwarding task status
update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 to the agent
> I0108 16:35:45.986654 17809 slave.cpp:5209] Forwarding the update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to master@172.16.10.110:37252
> I0108 16:35:45.986795 17809 slave.cpp:5102] Task status update manager successfully handled
status update TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of
framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
> I0108 16:35:45.986829 17809 slave.cpp:5118] Sending acknowledgement for status update
TASK_FAILED (Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to executor(1)@172.16.10.110:38499
> I0108 16:35:45.986901 17805 master.cpp:7890] Status update TASK_FAILED (Status UUID:
7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
from agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0 at slave(1)@172.16.10.110:37252 (ip-172-16-10-110.ec2.internal)
> I0108 16:35:45.986928 17805 master.cpp:7946] Forwarding status update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
> I0108 16:35:45.986984 17805 master.cpp:10193] Updating the state of task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 (latest state: TASK_FAILED, status update state:
TASK_FAILED)
> I0108 16:35:45.987047 17805 sched.cpp:990] Received status update TASK_FAILED (Status
UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
from slave(1)@172.16.10.110:37252
> I0108 16:35:45.987103 17805 sched.cpp:1029] Scheduler::statusUpdate took 30948ns
> I0108 16:35:45.987112 17805 sched.cpp:1048] Sending ACK for status update TASK_FAILED
(Status UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
to master@172.16.10.110:37252
> I0108 16:35:45.987221 17805 master.cpp:5826] Processing ACKNOWLEDGE call 7f544700-215b-4d27-ab43-b48e19592d00
for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 (default) at scheduler-4ad5073e-c1db-4c34-9c43-e656c280a724@172.16.10.110:37252
on agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
> I0108 16:35:45.987267 17805 master.cpp:10299] Removing task 1 with resources cpus(allocated:
*):2; mem(allocated: *):1024; disk(allocated: *):1024; ports(allocated: *):[31000-32000] of
framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000 on agent f09c89e1-aa62-4662-bda8-15a2c87f412e-S0
at slave(1)@172.16.10.110:37252 (ip-172-16-10-110.ec2.internal)
> I0108 16:35:45.987473 17807 task_status_update_manager.cpp:401] Received task status
update acknowledgement (UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
> I0108 16:35:45.987561 17807 task_status_update_manager.cpp:538] Cleaning up status update
stream for task 1 of framework f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
> I0108 16:35:45.987814 17807 slave.cpp:3974] Task status update manager successfully handled
status update acknowledgement (UUID: 7f544700-215b-4d27-ab43-b48e19592d00) for task 1 of framework
f09c89e1-aa62-4662-bda8-15a2c87f412e-0000
> I0108 16:35:45.987849 17807 slave.cpp:8935] Completing task 1
> {code}
> After further testing, [https://github.com/apache/mesos/blob/51a3bd95bd2d740a39b55634251abeadb561e5c8/src/docker/docker.cpp#L384]
appears to never be reached as {{ipAddressValue->value}} is an empty string.
> What happens according to {{docker logs}}:
> {code:java}
> The system has no more ptys.  Ask your system administrator to create more.
>     while executing
> "spawn -noecho echo out849cd741-4ba7-429c-979f-da5cb0b16e0c"
>     ("eval" body line 1)
>     invoked from within
> "eval [list spawn -noecho] $argv"
>     invoked from within
> "if {[string compare [lindex $argv 0] "-p"] == 0} {
>     # pipeline
>     set stty_init "-echo"
>     eval [list spawn -noecho] [lrange $argv 1 end]
>     clo..."
>     (file "/usr/bin/unbuffer" line 13)
> The system has no more ptys.  Ask your system administrator to create more.
>     while executing
> "spawn -noecho echo err849cd741-4ba7-429c-979f-da5cb0b16e0c"
>     ("eval" body line 1)
>     invoked from within
> "eval [list spawn -noecho] $argv"
>     invoked from within
> "if {[string compare [lindex $argv 0] "-p"] == 0} {
>     # pipeline
>     set stty_init "-echo"
>     eval [list spawn -noecho] [lrange $argv 1 end]
>     clo..."
>     (file "/usr/bin/unbuffer" line 13)
> {code}
> Removing the {{unbuffer}} in the commands in  [https://github.com/apache/mesos/blob/9c03a463c1ac8f63dc00255945a04016c45f04e9/src/tests/containerizer/docker_containerizer_tests.cpp#L2150-L2151]
solve the issue but they are here for a reason: [https://reviews.apache.org/r/43963] The
test, without {{unbuffer}}, has been successful even when running 100 times using {{GLOG_v=2
sudo ./mesos-tests.sh --gtest_filter="DockerContainerizerTest.ROOT_DOCKER_Logs" --gtest_break_on_failure
--gtest_repeat=100 --verbose}}.
> The command can be reproduced without using Mesos on Centos 6 (using Docker version 1.7.1,
build 786b29d) :
> {code:java}
> [centos@ip-10-16-234-12 bin]$ sudo docker run -i -t mesosphere/alpine-expect /bin/sh
> / # unbuffer echo mesos
> The system has no more ptys. Ask your system administrator to create more.
> while executing
> "spawn -noecho echo mesos"
> ("eval" body line 1)
> invoked from within
> "eval [list spawn -noecho] $argv"
> invoked from within
> "if {[string compare [lindex $argv 0] "-p"] == 0} {
> # pipeline
> set stty_init "-echo"
> eval [list spawn -noecho] [lrange $argv 1 end]
> clo..."
> (file "/usr/bin/unbuffer" line 13)
> / # echo mesos
> mesos{code}
> By default, \{{unbuffer}} is not installed on CentOS 6. Installing it does not resolve
the issue but the command works on CentOS 6:
> {code:java}
> [centos@ip-10-16-234-12 bin]$ sudo yum install expect
> [centos@ip-10-16-234-12 bin]$ unbuffer echo mesos
> mesos{code}



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