single:

ssh -o “StrictHostKeyChecking no”  -t ${server} ‘sudo sed -ibak -e ‘s#https://oldchef.server.com/#https://newchef.server.com/#g’ /etc/chef/client.rb’

many:

for server in server001 server002 server007; do echo ${server} & ssh -o “StrictHostKeyChecking no”  -t ${server} ‘sudo sed -ibak -e ‘s#https://oldchef.server.com/#https://newchef.server.com/#g’ /etc/chef/client.rb’ ; done

list:

for server in `cat nodelist.txt`; do echo ${server} & ssh -o “StrictHostKeyChecking no”  -t ${server} ‘sudo sed -ibak -e ‘s#https://oldchef.server.com/#https://newchef.server.com/#g’ /etc/chef/client.rb’ ; done

where nodelist.txt is like:

server001

server002

server003

server004

server005

server006

server007

Sorting out connection resets:

tcpdump -nn -v ‘tcp[tcpflags] & (tcp-rst) != 0’

or

tcpdump -ilo -nn -v ‘tcp[tcpflags] & (tcp-rst) != 0’

-n is to stop resolving DNS names

-nn is to stop resolving DNS names AND port numbers to names

This is really useful when an app is logging connection resets, but not telling you what it is trying to connect to in the first place.

Start with list.txt like:

server7858   server7858   server7858   server7858   server7861   server7860   server8310   server8310   server7863   server8311

server7859   server7859   server7859   server7859   server8781   server8676   server8677   server8677   server8679   server8782

Which has duplicates and long lines and crap. Run this:

rm list2.txt

rm list3.txt

for word in `cat list.txt`; do echo $word ; done |sort |uniq >> list2.txt

sed -ibak -e ‘s/ //g’ list2.txt

cat list2.txt |sort|uniq > list3.txt

vi list3.txt

ta da!

if you need word counts and such, pipe it through wc before running uniq

more metadata, this one is hard to find:

bash

list

word

parse

parsing

text

columns

sorting

collapse

words

shell

script

split

line

lines

grep

sudo cp /usr/lib64/libxcb.so.1 /usr/share/code/ libxcb.so.1

cd  /usr/share/code/

sudo sed -ibak -e ‘s/BIG-REQUESTS/_IG-REQUESTS/g’  libxcb.so.1

Had the exact same problem with Atom and this worked for that too.

if [[ ${TAG_VALUE}XXX == “XXX” ]]; then

echo “TAG_VALUE was blank, exiting!”

exit

fi

case ${TAG_VALUE} in

1)

echo ‘I am the first box’

;;

2)

echo ‘I am the second box’

;;

3)

echo ‘I am the third box’

;;

4)

echo ‘I am the fourth box’

;;

5)

echo ‘I am the fifth box’

;;

*)

echo ‘I am another box higher than 5’

;;

esac

# To read the Name tag:

TAG_NAME=”Name”

INSTANCE_ID=”`./ec2-metadata -i | cut -f 2 -d ” ” `”

REGION=”`././ec2-metadata -z | cut -f 2 -d ” ” `”

REGION=${REGION%?}

TAG_VALUE=”`aws ec2 describe-tags –filters “Name=resource-id,Values=$INSTANCE_ID” “Name=key,Values=$TAG_NAME” –region $REGION –output=text | cut -f5`”

Gives:

set |grep TAG_VALUE

TAG_VALUE=’brad test box’

# To see ALL tags to see WTF: (use region from above)

aws ec2 describe-tags –region us-east-1 –output=text

# To read the Created-by custom tag:

TAG_NAME=”created-by”

INSTANCE_ID=”`./ec2-metadata -i | cut -f 2 -d ” ” `”

REGION=”`././ec2-metadata -z | cut -f 2 -d ” ” `”

REGION=${REGION%?}

TAG_VALUE=”`aws ec2 describe-tags –filters “Name=resource-id,Values=$INSTANCE_ID” “Name=key,Values=$TAG_NAME” –region $REGION –output=text | cut -f5`”

set |grep TAG_VALUE

TAG_VALUE=test-kitchen

# To read the nifi-node-num custom tag:

TAG_NAME=”nifi-node-num”

echo “TAG_NAME is: ” ${TAG_NAME}

INSTANCE_ID=”`./ec2-metadata -i | cut -f 2 -d ” ” `”

echo “INSTANCE_ID is: ” ${INSTANCE_ID}

REGION=”`././ec2-metadata -z | cut -f 2 -d ” ” `”

REGION=${REGION%?}

echo “REGION is: ” ${REGION}

TAG_VALUE=”`aws ec2 describe-tags –filters “Name=resource-id,Values=$INSTANCE_ID” “Name=key,Values=$TAG_NAME” –region $REGION –output=text | cut -f5`”

echo “TAG_VALUE is: ” ${TAG_VALUE}

# You need the EC2 Metadata binary for the above to work

wget http://s3.amazonaws.com/ec2metadata/ec2-metadata

chmod u+x ec2-metadata

./ec2-metadata –help