2026-04-14 03:02:39,032: INFO: Building opensdn-external-redis 2026-04-14 03:02:39,432: INFO: Building args: --network host --build-arg PIP_REPOSITORY=http://localhost:6667/pip/simple --build-arg CONTRAIL_REGISTRY=nexus.gz1.opensdn.io:5101 --build-arg CONTRAIL_CONTAINER_TAG=master-2_7_8_4-1 --build-arg SITE_MIRROR=http://nexus.gz1.opensdn.io/repository/external-web-cache --build-arg LINUX_DISTR_VER=9 --build-arg LINUX_DISTR=rockylinux --build-arg CONTAINER_NAME=opensdn-external-redis --build-arg UBUNTU_DISTR_VERSION=24.04 --build-arg UBUNTU_DISTR=ubuntu --build-arg VENDOR_NAME=OpenSDN-IO --build-arg VENDOR_DOMAIN=io.opensdn --build-arg BUILD_IMAGE=tf-dev-sandbox:compile --build-arg BUILD_ROOT=/buildroot --build-arg DEBUGINFO_ROOT=/debuginfo #0 building with "default" instance using docker driver #1 [internal] load build definition from Dockerfile #1 transferring dockerfile: #1 transferring dockerfile: 1.61kB done #1 DONE 0.2s #2 [internal] load metadata for docker.io/library/redis:6.0.19 #2 DONE 1.8s #3 [internal] load .dockerignore #3 transferring context: #3 transferring context: 2B done #3 DONE 0.8s #4 [1/5] FROM docker.io/library/redis:6.0.19@sha256:5ebe2e77efc9e38ab9c906acb0df6f8987f98de0ebf115de41767d6fa014329d #4 resolve docker.io/library/redis:6.0.19@sha256:5ebe2e77efc9e38ab9c906acb0df6f8987f98de0ebf115de41767d6fa014329d 0.0s done #4 sha256:5ebe2e77efc9e38ab9c906acb0df6f8987f98de0ebf115de41767d6fa014329d 1.86kB / 1.86kB done #4 sha256:1cfa0ddd190132a3ac15b2fe553d6539dc9f5359fde58cd459a2c45f2ad98d71 1.57kB / 1.57kB done #4 sha256:45d02b8e757821252351546e8ce9da84da474108d233a043886eb76f2ca9bc97 7.79kB / 7.79kB done #4 sha256:bb595d48e52d9f8dc4435a8f6723c518232bbd423a97909627c113a293eea9a3 0B / 1.12kB 0.1s #4 sha256:d479b54c3bb2879fe377f6b0edc0a19237e58f109cf61b69b8559f5e4addb0a4 0B / 1.44MB 0.1s #4 sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 1.05MB / 29.12MB 0.1s #4 sha256:bb595d48e52d9f8dc4435a8f6723c518232bbd423a97909627c113a293eea9a3 1.12kB / 1.12kB 0.1s done #4 sha256:d479b54c3bb2879fe377f6b0edc0a19237e58f109cf61b69b8559f5e4addb0a4 1.44MB / 1.44MB 0.1s done #4 sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 8.39MB / 29.12MB 0.3s #4 sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 0B / 16.01MB 0.3s #4 sha256:b96556682ce1de97db9aa0ff9fe78bfdf91b7ce67b1ffd346425ea8d9e6cfbf6 134B / 134B 0.3s #4 sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 13.63MB / 29.12MB 0.4s #4 sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 3.15MB / 16.01MB 0.4s #4 sha256:b96556682ce1de97db9aa0ff9fe78bfdf91b7ce67b1ffd346425ea8d9e6cfbf6 134B / 134B 0.3s done #4 ... #5 [internal] load build context #5 transferring context: 49.21kB 0.0s done #5 DONE 0.5s #4 [1/5] FROM docker.io/library/redis:6.0.19@sha256:5ebe2e77efc9e38ab9c906acb0df6f8987f98de0ebf115de41767d6fa014329d #4 sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 22.02MB / 29.12MB 0.6s #4 sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 11.11MB / 16.01MB 0.6s #4 sha256:0df3a9e3510c99d668785cd15d52c9f4e459d6a6ca4da5fbeaad3c91ed369051 573B / 573B 0.6s done #4 sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 29.12MB / 29.12MB 0.8s #4 sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 16.01MB / 16.01MB 0.8s #4 sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 29.12MB / 29.12MB 0.9s done #4 sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 16.01MB / 16.01MB 0.9s done #4 extracting sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 #4 extracting sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 5.1s #4 extracting sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 10.1s #4 extracting sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 15.5s #4 extracting sha256:faef57eae888cbe4a5613eca6741b5e48d768b83f6088858aee9a5a2834f8151 20.9s done #4 extracting sha256:bb595d48e52d9f8dc4435a8f6723c518232bbd423a97909627c113a293eea9a3 #4 extracting sha256:bb595d48e52d9f8dc4435a8f6723c518232bbd423a97909627c113a293eea9a3 0.0s done #4 extracting sha256:d479b54c3bb2879fe377f6b0edc0a19237e58f109cf61b69b8559f5e4addb0a4 #4 extracting sha256:d479b54c3bb2879fe377f6b0edc0a19237e58f109cf61b69b8559f5e4addb0a4 0.7s done #4 extracting sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 #4 extracting sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 5.2s #4 extracting sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 10.2s #4 extracting sha256:f1b700c31442a3789e42bb4aa2f8bd4e4a590e4865f675fc2d92e434b54dcab3 12.2s done #4 extracting sha256:b96556682ce1de97db9aa0ff9fe78bfdf91b7ce67b1ffd346425ea8d9e6cfbf6 #4 extracting sha256:b96556682ce1de97db9aa0ff9fe78bfdf91b7ce67b1ffd346425ea8d9e6cfbf6 0.1s done #4 extracting sha256:0df3a9e3510c99d668785cd15d52c9f4e459d6a6ca4da5fbeaad3c91ed369051 done #4 DONE 38.7s #6 [2/5] RUN mkdir /licenses #6 DONE 1.0s #7 [3/5] COPY __licensing.txt /licenses/licensing.txt #7 DONE 0.6s #8 [4/5] COPY *.sh / #8 DONE 0.4s #9 [5/5] RUN set -e ; /bin/bash -c 'for item in `ls /__*` ; do mv $item /${item:3} ; done' ; export DEBIAN_FRONTEND=noninteractive ; apt-get update || /bin/true ; apt-get -y install python3-minimal ; groupadd --gid 1999 --system contrail ; usermod -a -G 1999 redis ; apt-get clean && rm -rf /var/lib/apt/lists/* #9 0.855 /bin/bash: warning: setlocale: LC_ALL: cannot change locale (en_US.UTF-8) #9 1.021 Get:1 http://deb.debian.org/debian bookworm InRelease [151 kB] #9 1.145 Get:2 http://deb.debian.org/debian bookworm-updates InRelease [55.4 kB] #9 1.194 Get:3 http://deb.debian.org/debian-security bookworm-security InRelease [48.0 kB] #9 1.353 Get:4 http://deb.debian.org/debian bookworm/main amd64 Packages [8792 kB] #9 1.824 Get:5 http://deb.debian.org/debian bookworm-updates/main amd64 Packages [6924 B] #9 1.824 Get:6 http://deb.debian.org/debian-security bookworm-security/main amd64 Packages [294 kB] #9 4.012 Fetched 9347 kB in 3s (3027 kB/s) #9 4.012 Reading package lists... #9 5.094 Reading package lists... #9 5.794 Building dependency tree... #9 6.108 Reading state information... #9 6.535 The following additional packages will be installed: #9 6.535 ca-certificates libexpat1 libgpm2 libncursesw6 libpython3.11-minimal #9 6.535 libpython3.11-stdlib libreadline8 libsqlite3-0 libssl3 media-types openssl #9 6.535 python3.11 python3.11-minimal readline-common #9 6.535 Suggested packages: #9 6.535 gpm python3.11-venv python3.11-doc binutils binfmt-support readline-doc #9 6.724 The following NEW packages will be installed: #9 6.724 ca-certificates libexpat1 libgpm2 libncursesw6 libpython3.11-minimal #9 6.724 libpython3.11-stdlib libreadline8 libsqlite3-0 media-types openssl #9 6.724 python3-minimal python3.11 python3.11-minimal readline-common #9 6.724 The following packages will be upgraded: #9 6.724 libssl3 #9 6.835 1 upgraded, 14 newly installed, 0 to remove and 48 not upgraded. #9 6.835 Need to get 10.2 MB of archives. #9 6.835 After this operation, 27.6 MB of additional disk space will be used. #9 6.835 Get:1 http://deb.debian.org/debian-security bookworm-security/main amd64 libssl3 amd64 3.0.19-1~deb12u2 [2032 kB] #9 7.074 Get:2 http://deb.debian.org/debian bookworm/main amd64 libpython3.11-minimal amd64 3.11.2-6+deb12u6 [817 kB] #9 7.083 Get:3 http://deb.debian.org/debian bookworm/main amd64 libexpat1 amd64 2.5.0-1+deb12u2 [99.9 kB] #9 7.083 Get:4 http://deb.debian.org/debian bookworm/main amd64 python3.11-minimal amd64 3.11.2-6+deb12u6 [2064 kB] #9 7.133 Get:5 http://deb.debian.org/debian bookworm/main amd64 python3-minimal amd64 3.11.2-1+b1 [26.3 kB] #9 7.133 Get:6 http://deb.debian.org/debian bookworm/main amd64 readline-common all 8.2-1.3 [69.0 kB] #9 7.133 Get:7 http://deb.debian.org/debian-security bookworm-security/main amd64 openssl amd64 3.0.19-1~deb12u2 [1435 kB] #9 7.155 Get:8 http://deb.debian.org/debian bookworm/main amd64 ca-certificates all 20230311+deb12u1 [155 kB] #9 7.155 Get:9 http://deb.debian.org/debian bookworm/main amd64 media-types all 10.0.0 [26.1 kB] #9 7.155 Get:10 http://deb.debian.org/debian bookworm/main amd64 libgpm2 amd64 1.20.7-10+b1 [14.2 kB] #9 7.155 Get:11 http://deb.debian.org/debian bookworm/main amd64 libncursesw6 amd64 6.4-4 [134 kB] #9 7.189 Get:12 http://deb.debian.org/debian bookworm/main amd64 libreadline8 amd64 8.2-1.3 [166 kB] #9 7.194 Get:13 http://deb.debian.org/debian bookworm/main amd64 libsqlite3-0 amd64 3.40.1-2+deb12u2 [839 kB] #9 7.204 Get:14 http://deb.debian.org/debian bookworm/main amd64 libpython3.11-stdlib amd64 3.11.2-6+deb12u6 [1798 kB] #9 7.244 Get:15 http://deb.debian.org/debian bookworm/main amd64 python3.11 amd64 3.11.2-6+deb12u6 [573 kB] #9 7.340 perl: warning: Setting locale failed. #9 7.340 perl: warning: Please check that your locale settings: #9 7.340 LANGUAGE = "en_US.UTF-8", #9 7.340 LC_ALL = "en_US.UTF-8", #9 7.340 LANG = "en_US.UTF-8" #9 7.340 are supported and installed on your system. #9 7.340 perl: warning: Falling back to the standard locale ("C"). #9 7.493 debconf: delaying package configuration, since apt-utils is not installed #9 7.521 Fetched 10.2 MB in 1s (19.9 MB/s) #9 7.564 (Reading database ... (Reading database ... 5% (Reading database ... 10% (Reading database ... 15% (Reading database ... 20% (Reading database ... 25% (Reading database ... 30% (Reading database ... 35% (Reading database ... 40% (Reading database ... 45% (Reading database ... 50% (Reading database ... 55% (Reading database ... 60% (Reading database ... 65% (Reading database ... 70% (Reading database ... 75% (Reading database ... 80% (Reading database ... 85% (Reading database ... 90% (Reading database ... 95% (Reading database ... 100% (Reading database ... 7847 files and directories currently installed.) #9 7.574 Preparing to unpack .../libssl3_3.0.19-1~deb12u2_amd64.deb ... #9 7.595 Unpacking libssl3:amd64 (3.0.19-1~deb12u2) over (3.0.9-1) ... #9 8.036 Selecting previously unselected package libpython3.11-minimal:amd64. #9 8.036 Preparing to unpack .../libpython3.11-minimal_3.11.2-6+deb12u6_amd64.deb ... #9 8.109 Unpacking libpython3.11-minimal:amd64 (3.11.2-6+deb12u6) ... #9 8.334 Selecting previously unselected package libexpat1:amd64. #9 8.334 Preparing to unpack .../libexpat1_2.5.0-1+deb12u2_amd64.deb ... #9 8.337 Unpacking libexpat1:amd64 (2.5.0-1+deb12u2) ... #9 8.540 Selecting previously unselected package python3.11-minimal. #9 8.540 Preparing to unpack .../python3.11-minimal_3.11.2-6+deb12u6_amd64.deb ... #9 8.619 Unpacking python3.11-minimal (3.11.2-6+deb12u6) ... #9 9.267 Setting up libssl3:amd64 (3.0.19-1~deb12u2) ... #9 9.316 Setting up libpython3.11-minimal:amd64 (3.11.2-6+deb12u6) ... #9 9.373 Setting up libexpat1:amd64 (2.5.0-1+deb12u2) ... #9 9.410 Setting up python3.11-minimal (3.11.2-6+deb12u6) ... #9 10.69 Selecting previously unselected package python3-minimal. #9 10.69 (Reading database ... (Reading database ... 5% (Reading database ... 10% (Reading database ... 15% (Reading database ... 20% (Reading database ... 25% (Reading database ... 30% (Reading database ... 35% (Reading database ... 40% (Reading database ... 45% (Reading database ... 50% (Reading database ... 55% (Reading database ... 60% (Reading database ... 65% (Reading database ... 70% (Reading database ... 75% (Reading database ... 80% (Reading database ... 85% (Reading database ... 90% (Reading database ... 95% (Reading database ... 100% (Reading database ... 8163 files and directories currently installed.) #9 10.69 Preparing to unpack .../00-python3-minimal_3.11.2-1+b1_amd64.deb ... #9 10.70 Unpacking python3-minimal (3.11.2-1+b1) ... #9 10.75 Selecting previously unselected package readline-common. #9 10.75 Preparing to unpack .../01-readline-common_8.2-1.3_all.deb ... #9 10.96 Unpacking readline-common (8.2-1.3) ... #9 11.10 Selecting previously unselected package openssl. #9 11.10 Preparing to unpack .../02-openssl_3.0.19-1~deb12u2_amd64.deb ... #9 11.10 Unpacking openssl (3.0.19-1~deb12u2) ... #9 11.34 Selecting previously unselected package ca-certificates. #9 11.34 Preparing to unpack .../03-ca-certificates_20230311+deb12u1_all.deb ... #9 11.35 Unpacking ca-certificates (20230311+deb12u1) ... #9 11.48 Selecting previously unselected package media-types. #9 11.48 Preparing to unpack .../04-media-types_10.0.0_all.deb ... #9 11.48 Unpacking media-types (10.0.0) ... #9 11.54 Selecting previously unselected package libgpm2:amd64. #9 11.54 Preparing to unpack .../05-libgpm2_1.20.7-10+b1_amd64.deb ... #9 11.54 Unpacking libgpm2:amd64 (1.20.7-10+b1) ... #9 11.64 Selecting previously unselected package libncursesw6:amd64. #9 11.64 Preparing to unpack .../06-libncursesw6_6.4-4_amd64.deb ... #9 11.64 Unpacking libncursesw6:amd64 (6.4-4) ... #9 11.77 Selecting previously unselected package libreadline8:amd64. #9 11.77 Preparing to unpack .../07-libreadline8_8.2-1.3_amd64.deb ... #9 12.16 Unpacking libreadline8:amd64 (8.2-1.3) ... #9 13.11 Selecting previously unselected package libsqlite3-0:amd64. #9 13.11 Preparing to unpack .../08-libsqlite3-0_3.40.1-2+deb12u2_amd64.deb ... #9 13.12 Unpacking libsqlite3-0:amd64 (3.40.1-2+deb12u2) ... #9 13.41 Selecting previously unselected package libpython3.11-stdlib:amd64. #9 13.41 Preparing to unpack .../09-libpython3.11-stdlib_3.11.2-6+deb12u6_amd64.deb ... #9 13.42 Unpacking libpython3.11-stdlib:amd64 (3.11.2-6+deb12u6) ... #9 13.73 Selecting previously unselected package python3.11. #9 13.73 Preparing to unpack .../10-python3.11_3.11.2-6+deb12u6_amd64.deb ... #9 13.73 Unpacking python3.11 (3.11.2-6+deb12u6) ... #9 13.89 Setting up media-types (10.0.0) ... #9 14.37 Setting up libgpm2:amd64 (1.20.7-10+b1) ... #9 14.53 Setting up libsqlite3-0:amd64 (3.40.1-2+deb12u2) ... #9 14.71 Setting up libncursesw6:amd64 (6.4-4) ... #9 15.52 Setting up python3-minimal (3.11.2-1+b1) ... #9 15.77 Setting up openssl (3.0.19-1~deb12u2) ... #9 16.02 Setting up readline-common (8.2-1.3) ... #9 16.10 Setting up libreadline8:amd64 (8.2-1.3) ... #9 16.16 Setting up ca-certificates (20230311+deb12u1) ... #9 16.74 Updating certificates in /etc/ssl/certs... #9 17.42 142 added, 0 removed; done. #9 17.73 Setting up libpython3.11-stdlib:amd64 (3.11.2-6+deb12u6) ... #9 17.77 Setting up python3.11 (3.11.2-6+deb12u6) ... #9 18.58 Processing triggers for libc-bin (2.36-9) ... #9 18.64 Processing triggers for ca-certificates (20230311+deb12u1) ... #9 18.66 Updating certificates in /etc/ssl/certs... #9 19.43 0 added, 0 removed; done. #9 19.43 Running hooks in /etc/ca-certificates/update.d... #9 19.44 done. #9 DONE 19.8s #10 exporting to image #10 exporting layers #10 exporting layers 1.1s done #10 writing image sha256:0795dc61d40de996e0372b8166275df86319374c5c284c4d1057c21f508a3792 done #10 naming to nexus.gz1.opensdn.io:5101/opensdn-external-redis:master-2_7_8_4-1 done #10 DONE 1.2s 2026-04-14 03:03:45,505: INFO: Docker build duration: 66 seconds The push refers to repository [nexus.gz1.opensdn.io:5101/opensdn-external-redis] de16a50e3dc3: Preparing 157130c2cc3a: Preparing e5d362243e97: Preparing 926480644f8a: Preparing 7bba6b363087: Preparing 3f9101b13221: Preparing 64e5d4720c56: Preparing ffea3cb2217f: Preparing 21f4147c6ace: Preparing 24839d45ca45: Preparing de16a50e3dc3: Waiting 157130c2cc3a: Waiting e5d362243e97: Waiting 926480644f8a: Waiting 7bba6b363087: Waiting 3f9101b13221: Waiting 64e5d4720c56: Waiting ffea3cb2217f: Waiting 21f4147c6ace: Waiting 24839d45ca45: Waiting 157130c2cc3a: Pushed e5d362243e97: Pushed 926480644f8a: Pushed 7bba6b363087: Pushed 3f9101b13221: Pushed ffea3cb2217f: Pushed 21f4147c6ace: Pushed de16a50e3dc3: Pushed 64e5d4720c56: Pushed 24839d45ca45: Pushed master-2_7_8_4-1: digest: sha256:b99b5cd9257847ad056b4c8baaa76ed2d4a5dfbf8f2a9e06c17d9743686472f7 size: 2411 2026-04-14 03:04:07,982: INFO: Building opensdn-external-redis finished successfully, duration: 88 seconds WARNING: This output is designed for human readability. For machine-readable output, please use --format. IMAGE ID DISK USAGE CONTENT SIZE EXTRA nexus.gz1.opensdn.io:5101/opensdn-analytics-base:master-2_7_8_4-1 63b7c5e2d176 667MB 0B nexus.gz1.opensdn.io:5101/opensdn-analytics-snmp-base:master-2_7_8_4-1 4b8bc3cb48fa 908MB 0B nexus.gz1.opensdn.io:5101/opensdn-ansible-deployer-src:master-2_7_8_4-1 e3b9b7dc38de 1.41MB 0B nexus.gz1.opensdn.io:5101/opensdn-base:master-2_7_8_4-1 8b75583cd9c0 667MB 0B nexus.gz1.opensdn.io:5101/opensdn-build-manifest-src:master-2_7_8_4-1 310fefae73c1 4.17kB 0B nexus.gz1.opensdn.io:5101/opensdn-charms-src:master-2_7_8_4-1 6375b62156cd 6.05MB 0B nexus.gz1.opensdn.io:5101/opensdn-container-builder-src:master-2_7_8_4-1 c45c9e2400e3 2.49MB 0B nexus.gz1.opensdn.io:5101/opensdn-controller-config-base:master-2_7_8_4-1 d146b645c89a 667MB 0B nexus.gz1.opensdn.io:5101/opensdn-controller-control-base:master-2_7_8_4-1 de9eb6881f72 726MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-cassandra:master-2_7_8_4-1 15de6783bc84 331MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-haproxy:master-2_7_8_4-1 ce72016ecae8 144MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-kafka:master-2_7_8_4-1 5bed08b4eec5 392MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-rabbitmq:master-2_7_8_4-1 a45122b20b0e 363MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-redis:master-2_7_8_4-1 0795dc61d40d 171MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-rsyslogd:master-2_7_8_4-1 db1f00bb9f5c 440MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-stunnel:master-2_7_8_4-1 afe28bfe7153 454MB 0B nexus.gz1.opensdn.io:5101/opensdn-external-zookeeper:master-2_7_8_4-1 bc68e700388c 301MB 0B nexus.gz1.opensdn.io:5101/opensdn-general-base:master-2_7_8_4-1 f26aab422c81 428MB 0B nexus.gz1.opensdn.io:5101/opensdn-kolla-ansible-src:master-2_7_8_4-1 0ae47050305d 32.7MB 0B nexus.gz1.opensdn.io:5101/opensdn-vrouter-base:master-2_7_8_4-1 25c263f53625 734MB 0B nexus.gz1.opensdn.io:5101/tf-dev-sandbox:frozen e3842d416e7d 2.9GB 0B U rockylinux:9 9cc24f05f309 176MB 0B tf-dev-sandbox:compile b370baef2d72 22.2GB 0B tf-dev-sandbox:frozen e3842d416e7d 2.9GB 0B U