export goproxy GOPROXY=https://goproxy.cn

[root@bogon ~]# cd karmada/
[root@bogon karmada]#  env CLUSTER_IP_ONLY=true hack/remote-up-karmada.sh ~/82.k8s.conf kubernetes-admin@kubernetes
go get github.com/cloudflare/cfssl/cmd/...@v1.5.0: github.com/cloudflare/cfssl/cmd@v1.5.0: Get "https://proxy.golang.org/github.com/cloudflare/cfssl/cmd/@v/v1.5.0.info": dial tcp 142.251.43.17:443: i/o timeout
You have mail in /var/spool/mail/root
[root@bogon karmada]# export GOPROXY=https://goproxy.cn
[root@bogon karmada]#  env CLUSTER_IP_ONLY=true hack/remote-up-karmada.sh ~/82.k8s.conf kubernetes-admin@kubernetes
go: downloading github.com/cloudflare/cfssl v1.5.0
go: found github.com/cloudflare/cfssl/cmd/... in github.com/cloudflare/cfssl v1.5.0
go: downloading github.com/go-sql-driver/mysql v1.4.0
go: downloading github.com/lib/pq v1.3.0
go: downloading github.com/zmap/zlint/v2 v2.2.1
go: downloading github.com/jmoiron/sqlx v1.2.0
go: downloading github.com/google/certificate-transparency-go v1.0.21
go: downloading github.com/jmhodges/clock v0.0.0-20160418191101-880ee4c33548
go: downloading google.golang.org/appengine v1.6.6
go: downloading github.com/mattn/go-sqlite3 v1.10.0
go: downloading github.com/zmap/zcrypto v0.0.0-20200911161511-43ff0ea04f21
go: downloading github.com/weppos/publicsuffix-go v0.13.0
go: downloading golang.org/x/crypto v0.0.0-20201012173705-84dcc777aaee
go: downloading github.com/golang/protobuf v1.3.1
go: downloading golang.org/x/net v0.0.0-20201010224723-4f7140c49acb
go: downloading github.com/cloudflare/go-metrics v0.0.0-20151117154305-6a9aea36fb41
go: downloading golang.org/x/text v0.3.3
go: downloading github.com/kisielk/sqlstruct v0.0.0-20150923205031-648daed35d49
go: downloading github.com/GeertJohan/go.rice v1.0.0
go: downloading github.com/cloudflare/redoctober v0.0.0-20171127175943-746a508df14c
go: downloading github.com/daaku/go.zipexe v1.0.0
go: downloading github.com/getsentry/raven-go v0.0.0-20180121060056-563b81fc02b7
go: downloading github.com/pkg/errors v0.8.0
go: downloading github.com/certifi/gocertifi v0.0.0-20180118203423-deb3ae2ef261