How to spawn a bash shell with limited memory limits .

limit_memory_with_cgroup.sh

sudo dnf install libcgroup-tools

export MY_CGROUP_NAME="java_build"
export MY_SUBSYSTEMS="memory"
# create cgroup according to above vars
sudo cgcreate -t $USER:$USER -a $USER:$USER  -g $MY_SUBSYSTEMS:$MY_CGROUP_NAME 
# lazily use this to calculate bytes: http://extraconversion.com/data-storage/gibibytes/gibibytes-to-bytes.html
MEMORY_VALUE_IN_BYTES=$(python -c 'print int(0.3 * 1024 * 1024 * 1024) ') # first number is the number of GiB
# configure cgroup limits
sudo cgset -r memory.limit_in_bytes=$MEMORY_VALUE_IN_BYTES $MY_CGROUP_NAME

# verify group exists
# ls -al /sys/fs/cgroup/$MY_SUBSYSTEMS/$MY_CGROUP_NAME/

cgexec -g $MY_SUBSYSTEMS:$MY_CGROUP_NAME /bin/bash

# verify shell belongs to the right cgroup
ps -o cgroup $BASHPID

./tools/bin/syndesis build --batch-mode --module ui-angular,ui-react --docker | tee build_log.txt


ps -o cgroup $BASHPID

# if you want to delete the group (ignore the error)
# cgdelete -g $MY_SUBSYSTEMS:$MY_CGROUP_NAME