Netcat is one utility in NMap toolset, it maybe named as nc, ncat or netcat on different Linux distributions. (It's ncat on CentOS 6).
On CentOS 6 netcat is not installed by default, to install it we can run following command
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yum install nmap |
Then run following command to check netcat is installed correctly
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ncat -v |
Installing docker-ce on CentOS 6.9 got following error
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Resolving Dependencies --> Running transaction check ---> Package docker-ce.x86_64 0:18.03.1.ce-1.el7.centos will be installed --> Processing Dependency: container-selinux >= 2.9 for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libseccomp >= 2.3 for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libsystemd.so.0(LIBSYSTEMD_209)(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: pigz for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: systemd-units for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libc.so.6(GLIBC_2.17)(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libseccomp.so.2()(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libsystemd.so.0()(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Running transaction check ---> Package docker-ce.x86_64 0:18.03.1.ce-1.el7.centos will be installed --> Processing Dependency: container-selinux >= 2.9 for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libseccomp >= 2.3 for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libsystemd.so.0(LIBSYSTEMD_209)(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: systemd-units for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libc.so.6(GLIBC_2.17)(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libseccomp.so.2()(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 --> Processing Dependency: libsystemd.so.0()(64bit) for package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 ---> Package pigz.x86_64 0:2.3.4-1.el6 will be installed --> Processing Conflict: docker-ce-18.03.1.ce-1.el7.centos.x86_64 conflicts docker-io --> Finished Dependency Resolution Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: libsystemd.so.0(LIBSYSTEMD_209)(64bit) Error: docker-ce conflicts with docker-io-1.7.1-2.el6.x86_64 Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: libc.so.6(GLIBC_2.17)(64bit) Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: systemd-units Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: libseccomp >= 2.3 Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: libseccomp.so.2()(64bit) Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: libsystemd.so.0()(64bit) Error: Package: docker-ce-18.03.1.ce-1.el7.centos.x86_64 (docker-ce-stable) Requires: container-selinux >= 2.9 You could try using --skip-broken to work around the problem You could try running: rpm -Va --nofiles --nodigest |
To install docker on CentOS 6, run the following command
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yum install docker-io |
Then run
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docker --version |
Its output is
Docker version 1.7.1, build 786b29d/1.7.1
We can see docker is installed successfully.