Execute commands in any dcos task. dcos task exec cli is only for mesos containers, this script can be used to ssh into mesos and docker containers.

dcosTaskExec.sh

#!/bin/bash

echo "DCOS Task Exec 2.0"
if [ "$#" -eq 0 ]; then
        echo "Need task name or id as input. Exiting."
        exit 1
fi
taskName=$1
taskCmd=${2:-bash}
TMP_TASKLIST_JSON=/tmp/dcostasklist.json
dcos task --json > $TMP_TASKLIST_JSON
taskExist=`cat /tmp/dcostasklist.json | jq --arg tname $taskName '.[] | if(.name == $tname ) then .name else empty end' -r | wc -l`
if [[ $taskExist -eq 0 ]]; then 
        echo "No task with name $taskName exists."
        echo "Do you mean ?"
        dcos task | grep $taskName | awk '{print $1}'
        exit 1
fi
taskType=`cat $TMP_TASKLIST_JSON | jq --arg tname $taskName '[.[] | select(.name == $tname)][0] | .container.type' -r`
TaskId=`cat $TMP_TASKLIST_JSON | jq --arg tname $taskName '[.[] | select(.name == $tname)][0] | .id' -r`
if [[ $taskExist -ne 1 ]]; then
        echo -e "More than one instances. Please select task ID for executing command.\n"
        #allTaskIds=$(dcos task $taskName | tee /dev/tty | grep -v "NAME" | awk '{print $5}' | paste -s -d",")
        echo ""
        read TaskId
fi
if [[ $taskType !=  "DOCKER" ]]; then
        echo "Task [ $taskName ] is of type MESOS Container."
        execCmd="dcos task exec --interactive --tty $TaskId $taskCmd"
        echo "Running [$execCmd]"
        $execCmd
else
        echo "Task [ $taskName ] is of type DOCKER Container."
        taskNodeIP=`dcos task $TaskId | awk 'FNR == 2 {print $2}'`
        echo "Task [ $taskName ] with task Id [ $TaskId ] is running on node [ $taskNodeIP ]."
        taskContID=`dcos node ssh --option LogLevel=quiet --option StrictHostKeyChecking=no --private-ip=$taskNodeIP --master-proxy "docker ps -q --filter "label=MESOS_TASK_ID=$TaskId"" 2> /dev/null`
        taskContID=`echo $taskContID | tr -d '\r'`
        echo "Task Docker Container ID : [ $taskContID ]"
        echo "Running [ docker exec -it $taskContID $taskCmd ]"
        dcos node ssh --option StrictHostKeyChecking=no --option LogLevel=quiet --private-ip=$taskNodeIP --master-proxy "docker exec -it $taskContID $taskCmd" 2>/dev/null
fi