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While running devstack I'm getting following error,please help.Thanks in advance.

I'm trying to deploy openstack all in one node using devstack in CentOS 7.5 with 1 tb hard disk and 8gb RAM.I'm following the following documentation https://docs.openstack.org/devstack/latest/ .Following are the steps I have followed in breif

  1. $ sudo useradd -s /bin/bash -d /opt/stack -m stack
  2. $ echo "stack ALL=(ALL) NOPASSWD: ALL" | sudo tee /etc/sudoers.d/stack
  3. $ sudo su - stack
  4. $ git clone https://git.openstack.org/openstack-dev/devstack
  5. $ cd devstack $ ./stack.sh

my local.conf contain following line

[[local|localrc]]
HOST_IP=192.168.16.62
ADMIN_PASSWORD=secret
DATABASE_PASSWORD=$ADMIN_PASSWORD
RABBIT_PASSWORD=$ADMIN_PASSWORD
SERVICE_PASSWORD=$ADMIN_PASSWORD

I'm getting the following error

k/tools/cap-pip.txt
Collecting pip!=8,<10 (from -c /opt/stack/devstack/tools/cap-pip.txt (line 1))
  Retrying (Retry(total=4, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7f8827e47910>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/pip/
  Retrying (Retry(total=3, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7f8827e479d0>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/pip/
  Retrying (Retry(total=2, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7f8827e3e110>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/pip/
  Retrying (Retry(total=1, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7f8827e47410>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/pip/
  Retrying (Retry(total=0, connect=None, read=None, redirect=None, status=None)) after connection broken by 'NewConnectionError('<pip._vendor.urllib3.connection.VerifiedHTTPSConnection object at 0x7f8827e471d0>: Failed to establish a new connection: [Errno 101] Network is unreachable',)': /simple/pip/
  Could not find a version that satisfies the requirement pip!=8,<10 (from -c /opt/stack/devstack/tools/cap-pip.txt (line 1)) (from versions: )
No matching distribution found for pip!=8,<10 (from -c /opt/stack/devstack/tools/cap-pip.txt (line 1))
++./stack.sh:main:767                       err_trap
++./stack.sh:err_trap:563                   local r=1
++./stack.sh:err_trap:564                   set +o xtrace
stack.sh failed