diff --git a/tools/azure.sh b/tools/azure.sh
index d08a19e9..b661b590 100755
--- a/tools/azure.sh
+++ b/tools/azure.sh
@@ -11,6 +11,8 @@ if [[ -z "${DOCCANO_ADMIN_CONTACT_EMAIL}" ]]; then echo "Missing DOCCANO_ADMIN_C
 if [[ -z "${DOCCANO_ADMIN_PASSWORD}" ]]; then echo "Missing DOCCANO_ADMIN_PASSWORD environment variable" >&2; exit 1; fi
 if ! az account show >/dev/null; then echo "Must be logged into Azure" >&2; exit 2; fi
 
+set -o nounset
+
 az group create \
   --location "${DOCCANO_LOCATION}" \
   --name "${DOCCANO_RESOURCE_GROUP}"
diff --git a/tools/create-admin.sh b/tools/create-admin.sh
index d17e4ddd..72d76622 100755
--- a/tools/create-admin.sh
+++ b/tools/create-admin.sh
@@ -1,8 +1,9 @@
 #!/usr/bin/env bash
 
-if [[ "$#" -ne 3 ]]; then echo "Usage: $0 <username> <email> <password>" >&2; exit 1; fi
-
 set -o errexit
+set -o nounset
+
+if [[ "$#" -ne 3 ]]; then echo "Usage: $0 <username> <email> <password>" >&2; exit 1; fi
 
 python app/manage.py wait_for_db
 python app/manage.py migrate
diff --git a/tools/create-package.sh b/tools/create-package.sh
index e9896c8a..99b5e96f 100755
--- a/tools/create-package.sh
+++ b/tools/create-package.sh
@@ -1,4 +1,8 @@
 #!/usr/bin/env bash
+
+set -o errexit
+set -o nounset
+
 mkdir -p backend/client
 
 cd frontend
diff --git a/tools/dev-celery.sh b/tools/dev-celery.sh
index ec4e61e5..0c60a90c 100755
--- a/tools/dev-celery.sh
+++ b/tools/dev-celery.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
+
 set -o errexit
+set -o nounset
 
 cd "/src/backend"
 
diff --git a/tools/dev-django.sh b/tools/dev-django.sh
index de8d16c2..bbb5b9ea 100755
--- a/tools/dev-django.sh
+++ b/tools/dev-django.sh
@@ -1,6 +1,13 @@
 #!/usr/bin/env bash
+
 set -o errexit
 
+if [[ -z "${ADMIN_USERNAME}" ]]; then echo "Missing ADMIN_USERNAME environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_PASSWORD}" ]]; then echo "Missing ADMIN_PASSWORD environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_EMAIL}" ]]; then echo "Missing ADMIN_EMAIL environment variable" >&2; exit 1; fi
+
+set -o nounset
+
 app="/src/backend"
 
 echo "Initializing database"
@@ -18,4 +25,4 @@ if [[ -n "${ADMIN_USERNAME}" ]] && [[ -n "${ADMIN_PASSWORD}" ]] && [[ -n "${ADMI
 fi
 
 echo "Starting django"
-python -u "${app}/manage.py" runserver 0.0.0.0:8000
+python -u "${app}/manage.py" runserver ${HOST:-0.0.0.0}:${PORT:-8000}
diff --git a/tools/dev-nuxt.sh b/tools/dev-nuxt.sh
index 772bb16b..36c38d62 100755
--- a/tools/dev-nuxt.sh
+++ b/tools/dev-nuxt.sh
@@ -1,6 +1,7 @@
 #!/usr/bin/env bash
 
 set -o errexit
+set -o nounset
 
 root="$(dirname "$0")/.."
 app="${root}/frontend"
diff --git a/tools/heroku.sh b/tools/heroku.sh
index 07443663..f6252026 100644
--- a/tools/heroku.sh
+++ b/tools/heroku.sh
@@ -2,6 +2,12 @@
 
 set -o errexit
 
+if [[ -z "${ADMIN_USER_NAME}" ]]; then echo "Missing ADMIN_USER_NAME environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_PASSWORD}" ]]; then echo "Missing ADMIN_PASSWORD environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_CONTACT_EMAIL}" ]]; then echo "Missing ADMIN_CONTACT_EMAIL environment variable" >&2; exit 1; fi
+
+set -o nounset
+
 python /doccano/backend/manage.py migrate
 if [ -n "$ADMIN_USER_NAME" ]; then
     python /doccano/backend/manage.py create_admin --noinput --username="$ADMIN_USER_NAME" --email="$ADMIN_CONTACT_EMAIL" --password="$ADMIN_PASSWORD"
diff --git a/tools/install-mssql.sh b/tools/install-mssql.sh
index 358ad44b..c7b9d794 100755
--- a/tools/install-mssql.sh
+++ b/tools/install-mssql.sh
@@ -1,5 +1,8 @@
 #!/usr/bin/env bash
 
+set -o errexit
+set -o nounset
+
 # parse arguments
 mode="prod"
 for opt in "$@"; do
diff --git a/tools/prod-celery.sh b/tools/prod-celery.sh
index 73c4971f..0ffba164 100755
--- a/tools/prod-celery.sh
+++ b/tools/prod-celery.sh
@@ -1,5 +1,7 @@
 #!/usr/bin/env bash
+
 set -o errexit
+set -o nounset
 
 cd /backend
 
diff --git a/tools/prod-django.sh b/tools/prod-django.sh
index 7c38b719..976075ea 100755
--- a/tools/prod-django.sh
+++ b/tools/prod-django.sh
@@ -2,6 +2,12 @@
 
 set -o errexit
 
+if [[ -z "${ADMIN_USERNAME}" ]]; then echo "Missing ADMIN_USERNAME environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_PASSWORD}" ]]; then echo "Missing ADMIN_PASSWORD environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_EMAIL}" ]]; then echo "Missing ADMIN_EMAIL environment variable" >&2; exit 1; fi
+
+set -o nounset
+
 echo "Making staticfiles"
 static_dir=staticfiles
 if [[ ! -d $static_dir ]] || [[ -z $(ls -A $static_dir) ]]; then
@@ -25,4 +31,4 @@ if [[ -n "${ADMIN_USERNAME}" ]] && [[ -n "${ADMIN_PASSWORD}" ]] && [[ -n "${ADMI
 fi
 
 echo "Starting django"
-gunicorn --bind="0.0.0.0:${PORT:-8000}" --workers="${WORKERS:-4}" config.wsgi --timeout 300
+gunicorn --bind="${HOST:-0.0.0.0}:${PORT:-8000}" --workers="${WORKERS:-4}" config.wsgi --timeout 300
diff --git a/tools/run.sh b/tools/run.sh
index 84eb4cbe..5a008a02 100755
--- a/tools/run.sh
+++ b/tools/run.sh
@@ -2,6 +2,15 @@
 
 set -o errexit
 
+if [[ -z "${ADMIN_USERNAME}" ]]; then echo "Missing ADMIN_USERNAME environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_PASSWORD}" ]]; then echo "Missing ADMIN_PASSWORD environment variable" >&2; exit 1; fi
+if [[ -z "${ADMIN_EMAIL}" ]]; then echo "Missing ADMIN_EMAIL environment variable" >&2; exit 1; fi
+if [[ -z "${PORT}" ]]; then echo "Missing PORT environment variable" >&2; exit 1; fi
+if [[ -z "${WORKERS}" ]]; then echo "Missing WORKERS environment variable" >&2; exit 1; fi
+if [[ -z "${CELERY_WORKERS}" ]]; then echo "Missing CELERY_WORKERS environment variable" >&2; exit 1; fi
+
+set -o nounset
+
 echo "Making staticfiles"
 static_dir=staticfiles
 mkdir -p client/dist/static